Solved: VT-x is not available (VERR_VMX_NO_VMX) Error [100% Fix]


If you’ve ever tried to open a virtual machine using VirtualBox only to be met with the error “VT-x is not available (VERR_VMX_NO_VMX)”, then this blog post is for you.

With over two decades of expertise in the IT sector, our team has successfully guided numerous clients through this challenge. We recently resolved the same problem for another client. The following steps have been thoroughly vetted and proven effective based on our extensive experience.

VT-x, also known as Intel Virtualization Technology, performs hardware-level virtualization on your computer and it is necessary for the successful operation of various software that takes advantage of virtualization technology.

Key Takeaways

  • VT – x, also known as Intel Virtualization Technology, is necessary for the successful operation of the software that takes advantage of virtualization technology.
  • To enable VT – x from the BIOS, users must access their computer’s system settings menu specific to their device and update it.
  • Keep your computer’s drivers upgraded and disable the Memory Integrity option in Windows Defender to allow full utilization of hardware virtualization technology approved by the processor manufacturer.
  • Updating or reinstalling virtualization software can be an effective way to fix the error in VirtualBox.

Understanding VT-x Technology

VT-x, or Virtualization Technology extensions, is a feature of modern Intel processors that facilitates virtual machine (VM) and hardware assist technologies to improve the performance of VM execution.

Definition And Function

VT-x, also known as ‘Intel Virtualization Technology’ is a processor technology developed by Intel to increase the capacity and speed of virtual machines.

It enables hardware support for virtualization by allowing multiple operating systems to run on one physical system at the same time. This technology allows applications to be separated from their underlying hardware resources thus enhancing system performance and reliability.

By segregating memory and CPU operations in terms of the different VMs, media-intensive workloads can be allocated more efficiently across cores instead of competing with other cores for processor cycles.

Importance Of VT-x In Virtualization

VT-x is a powerful technology developed by Intel to allow the virtualization of systems on a single hardware platform. It enhances the efficiency and performance of virtual machines as well as provides advanced security measures used in modern software development, testing, cloud computing, and cybersecurity.

By optimizing the process that breaks down instructions given to processors into easier portions for execution, VT-x enables multiple operating systems to run concurrently on the same host computer, something which was previously impossible due to other forms of virtualization requiring different processor models from one another.

The benefits provided by VT-x are invaluable; not only do they reduce hardware costs significantly when compared with investing in specialized physical equipment for each project but it provides immense scalability opportunities through resource pooling while also improving disaster recovery capabilities drastically.

Causes Of The “VirtualBox Error VT-x Is Not Available (VERR_VMX_NO_VMX)”

The error can be caused by several factors, such as incorrect BIOS settings, incompatible CPU, and software or hardware conflicts.

BIOS Issues

BIOS (Basic Input / Output System) is a set of instructions found in the nonvolatile memory of a computer that acts as an interface between software and hardware.

It initializes all the components on your system, launching necessary programs when you turn it on and managing data flow between peripherals like keyboards or mice. To run virtual machines using VirtualBox, the VT-x option must be enabled from within BIOS settings to enable Intel’s Hardware-assisted virtualization feature.

Enabling this setting allows faster performance for running multiple operating systems simultaneously. This can also help with CPU-intensive tasks such as streaming media content online or gaming inside a VM without any interruption.

To access the BIOS settings, you need to restart your system and press “Del” or “F12/F10” continually while it boots up depending upon your computer’s motherboard model.

After entering into the bios menu, find options like “Virtual Technology” and then enable both VT-x/VT-d options from there.

CPU Compatibility

CPU compatibility is essential for virtualization and to correctly run the VT-x technology. If a compatible processor is not used, it can lead to errors.

The most commonly supported processors are Intel Core i3/i5/i7 as well as the AMD Ryzen series. When using other processors like Atom, Celeron, or Pentium you may experience conflicts between hardware resources and software limitations which will hinder your ability to use virtualization technologies optimally.

To prevent these issues from occurring ensure that your device contains a Modern processor that supports both VT-x and VT-d features when enabling virtualization support in BIOS settings.

Virtualization Software Settings

It is important to review the settings of your virtualization software to prevent the “VT-x not available” error from occurring. Popular products such as VirtualBox, VMWare, and Parallels Desktop are just a few of the diverse virtualization applications that may require setting modifications before utilizing them.

For instance, users need to ensure their version of VirtualBox is compatible with VT-x technology and enable Intel VT-X / AMD options for its technologies before operating Advanced Micro Devices (AMD) or Intel processors respectively within it.

Additionally, other third-party antivirus software may have conflicting features which could result in blocking certain requirements needed for proper virtualization; therefore you should check that no security modules are enabled or otherwise preventing full utilization of hardware virtualization technology approved by your processor manufacturer.

How To Fix “VT-x Is Not Available (VERR_VMX_NO_VMX)” Error In VirtualBox

1. Checking BIOS Settings

BIOS, or Basic Input/Output System, is a vital component of your computer’s firmware that helps in the booting process and enables virtualization. To enable VT-x from the BIOS, users must access their computer’s system settings menu specific to their device and update it. Depending on the manufacturer’s instructions one needs to go through the following steps with caution:

  1. Turn off the computer and restart it while pressing relevant keys such as F2, Esc or Delete to enter into BIOS setup. The model-depending key can be found mentioned in the documentation provided with the laptop or desktop manual guide.
  2. Entering into BIOS certain fields will help you find CPU options related to Virtualization Technology which includes various brands like Intel®Vt-x, AMD®V, ARM® Virt, etc. Verify if your processor supports Virtualization technology before turning the VMX option ON.
  3. Enable VMX via enabling the respective check box beside each brand; save changes made and exit the bios window by selecting “Save & Exit” or a similar option available based on device manufacturer interface guidelines; click “yes” when prompted whether are sure about applying new setting changes in further windows during the reboot process
  4. Restart the System after successful completion of the above step and try setting up the software again .By this time error message should have dissipated away allowing the user use to experience the smooth functioning of the required application

Important note: Be cautious when entering the bios setup menu, updating the wrong field might end up damaging the system permanently thereby corrupting the complete OS installation and requiring technicians’ assistance for restoring data back

2. Updating CPU Drivers

Updating CPU drivers can be an effective solution to the error in VirtualBox. Outdated CPU drivers can lead to compatibility issues between hardware and software, which in turn affects the successful usage of virtualization technology like HyperV or VirtualBox. Therefore, keeping your computer’s CPU drivers upgraded will ensure that all hardware features are functioning properly and there are no conflicts with any software installed on your system.

To update CPU drivers:

  1. Start by checking if driver updates are available from Windows Update or provided by your PC’s manufacturer website for download.
  2. If Windows does not offer a driver upgrade then look up specific motherboard model numbers on third-party sites such as Driverscape, DriverPack Solution, etc., where they have verifiable DirectX-certified compatible device lists based on user ratings offering new versions of outdated video cards and/or audio adapter versioning updates issued directly from Intel themselves as part of their NIC (Network Interface Card) family support packages.
  3. Select relevant driver downloads for your Operating System and install them according to the instructions found on the source location page.
  4. Alternatively, use an automated 3rd-party tool like Driver Booster to check for updated drivers more easily without having endless digging online across every corner of web-related links related regarding old motherboards, CPUs’ & other alike components including PLC – Programmable Logic Controllers too! This will give you complete control over OS which otherwise may render useless due to major changes brought down unilaterally either through hacking attempts solicited via malicious injections urls applied externally into networks IP settings ties inside home graphical interfaces {GUI} using GDIPlus calls whose parameters signatures must remain intact within registry entry points used by dll(Dynamic Link Library) installation files running up services needed when interacting with OpenGL rendering platforms.

Keeping up with the latest driver releases is a paramount upstream goal regular workers should adhere to protect nonessential operations become executed correctly safety manner, problem areas even identified before happening simply providing level proactive security measures suit particular networking environment respectively maintain optimal performance efficiency levels meant consumers users enjoyed its valued benefits uninterrupted activity routine task giving stern assurance events occurred seamlessly assured way

3. Reinstalling Or Updating Virtualization Software

Updating or reinstalling virtualization software is an effective way to fix the error in VirtualBox. The process of updating/reinstalling requires verifying that compatible hardware and software are present, ensuring that as Intel’s technology advances so too does the virtual machine setup itself. This helps prevent issues with incompatibilities that cause such errors.

By making sure to keep updated versions of both the server and client operating systems running, one can ensure a smoother experience for end users without any potential problems due to outdated software packages or drivers being used:

  • Verify compatibility between your server’s OS install version & clients’ devices by checking what system requirements are needed from each side before downloading new packages.
  • Check if you need any additional security applications installed on top of antivirus protection – some older programs may not support newer protocols used in more modern versions of Windows Server editions, etc., so make sure they have full compatibility first before attempting installation!
  • Keep track of driver updates for all computer components, including motherboard chipset ones; check manufacturer websites if necessary & download/install them accordingly when prompted by program alerts within your host application management console window(s).
  • Finalize all eventual patches or bug fixes related to applicable features and particular security policies assigned by vendors before deploying production services live into customer networks since old flaws can still be exploited even though they might have been already addressed previously across different test environments but eventually expired due long timeframes elapsed over their useful life cycle.

4. Enabling Nested Virtualization

Nested virtualization is a powerful feature of modern processor architectures that allows users to run multiple guest operating systems from within a single host computer. This technology is an important factor in improving the performance and scalability of virtualized environments, as it permits features such as running additional VMs inside existing VMs or supporting Hyper-V on Windows guests (that may need to be installed for certain types of software).

When enabled, nested virtualization allows users to gain access to hardware resources not available when using traditional non-virtualized configurations. That means developers and enthusiasts will find more freedom in setting up their computing environment without compromising overall control or stability. However, enabling this advanced feature requires certain steps depending on the type of processor and version of virtualization software being used.

Supported Virtualization Software:

Nested Virtualization is currently supported by a variety of major hypervisor platforms including VMware Workstation/ESXi, XenServer 7+, KVM on Linux/QEMU 2+5 series versions, Hyper-V 2019 Series 19H1 & later with Nested Assessment Toolkit (NAT) setup with compatible processors having VTx support enabled through BIOS settings., Microsoft Azure ARM 2012+4 Series & Compute Engine OpenStack Liberty+.

Important Considerations:

When enabling nested virtualization there are two primary considerations; proper CPU compatibility and appropriate BIOS settings. All CPUs must have Intel’s Xeon E3 v2 family instruction set architecture (ISA), which adds support for Advanced Vector Extensions (AVX). Additionally, many motherboards require special tweaks such as forcing VC pu events default mode from Enabled option so nesting can take full effect once activated via BIOS based upon related motherboard models along its user guide specifications.

5. Using A Different Virtualization Software

VT-x technology is an essential component of successful virtualization, as it provides hardware support for features that enable the tools to work better. It’s a set of technologies that allows processors to run multiple operating systems and applications at once, each in its own protected environment or “virtual machine.” This makes it possible for users to create complex networks and replicate conditions within them which means they can work with more advanced computing applications efficiently in a shorter amount of time.

VT-x enables higher performance levels when running virtual machines because it provides Intel processor support for many virtualized operations such as address translation, memory protection, and device emulation. The ability to improve performance without sacrificing compatibility with legacy devices is a key factor in why VT-x has become so widely used in enterprise environments.

To successfully utilize VT-x technology on any given computer system one must first ensure that their CPU supports this feature by checking the processor specifications or BIOS/UEFI settings before purchasing new hardware if needed. Additionally, most software platforms designed around supporting virtual machines require the enabling of specific configuration options either through BIOS/UEFI settings or directly from the platform’s interface itself (for example VirtualBox). Unfortunately, if these steps are not taken one may encounter errors while attempting to start up their VM instances; thankfully there are methods available that allow us to bring back usability again after diagnosing and verifying potential causes for failure such as:

  • Checking your Computer’s BIOS Settings
  • Updating Driver Software related computer chipsets & motherboards
  • Uninstalling then reinstalling the same version OR upgrading The Virtual Machine Management tool you plan on using
  • Enabling nested virtualization (if desired)
  • Utilizing alternative programs than those mentioned prior

Since understanding how these procedures beneficial help foster knowledge towards succeeding oneself in any form of technical issue resolution – let us now delve into some common solutions regarding resolving “VT-X Not Available / Unavailable Error Verr_Vmx No Vmx” issues starting from analyzing other various preventative tips towards keeping our computers safe towards

6. Enable VT-X From BIOS

Enabling VT-x from the BIOS is an important task to be performed on a computer before running virtual machines. It allows for better hardware compatibility and enables the system to be more efficient with its resources when running multiple operating systems. VT-x allows hardware virtualization, which helps to improve system performance and CPU utilization.

Though enabling VT-x is generally safe, it can have some potential risks that must be taken into consideration. If enabled incorrectly or if the hardware does not support the feature then computers may become unstable or unbootable. It is also recommended that users create backups of their documents as a precaution in case something does go wrong during the process.

To enable VT-x from BIOS;

  1. Entering BIOS by pressing the appropriate keys when powering up your PC/laptop (usually one of F2, F10, or Del).
  2. Accessing Advanced tab in BIOS settings -> Virtualization Technology -> Enable/ Disable it according to need -> Save settings & reboot for changes to take effect
  3. Verifying CPU Compatibility – Refer vendor’s manual or look up information online about your model’s supported processor types/brands to ensure the VT-x feature is compatible with your device’s hardware
  4. Creating a Backup – Make sure important documents are backed up on an external hard drive prior in case there are any issues while enabling or after using the VT-x feature
  5. Consulting Technical Support – In cases where necessary, users should consult with technical support before enabling full hardware virtualization capabilities of a device
  6. Precautionary Measures – Before enabling VT-x, additional measures such as disabling HyperV, Memory Integrity on Windows, or any 3rd party applications conflicts must be taken care of via corresponding settings within respective applications or software

7. Disable The Hyper-V or Turn Off Hyper-V Temporarily

Hyper-V is a virtualization technology developed by Microsoft that allows multiple operating systems to run on the same computer. It may cause conflicts with other virtualization software such as VirtualBox, resulting in the error. To fix this issue, disable Hyper-V from Control Panel, Windows Features, or Command Prompt.

• From Control Panel: Go to Programs and Features > Turn Windows features on or off > Find and uncheck Hyper-V from the list of optional features > Hit OK and restart your system after making changes.

• From Windows Feature: Go to Start Menu> Search for ‘Windows Features’> Disable the Hyper-V option > click OKand restart your PC after making changes.

8. Disable Memory Integrity

One of the solutions for resolving the error in VirtualBox involves disabling Memory Integrity. Memory Integrity is a virtualization-based protection feature in Windows Security that can detect low-level code injection and protect against malicious software. Unfortunately, this can also interact with advanced features found in third-party applications like VirtualBox which rely on hardware virtualization to function properly.

To troubleshoot any problems related to hardware virtualization, users should make sure that none of their security settings are preventing it from working correctly – starting with memory integrity which has been known to cause some conflicts. To do this, users need to first open the Windows Security application and then select “Device Security” from the top menu bar. Then simply uncheck “Enable Memory Integrity” and click Save Changes at the bottom for it to take effect. Therefore disabling memory integrity could resolve or reduce conflicts between third-party programs like VirtualBox and other built-in features such as Core isolation present in Windows 10 computers system. It’s important to note however that when memory integrity is disabled certain features may be subject to compromise by the malicious attack; therefore making some performance use unsuccessful while using certain software may have difficulty functioning. In addition, users must update the antivirus products installed on their computers regularly before disabling memory integrality since they will no longer have direct access since Microsoft Defender won’t automatically scan for threats if it’s enabled. As always, it’s recommended that the user check any conflicting software or hardware processes such as disabled core Isolation or Hyper V could be another potential cause problem instead of, so consider following all steps listed above before going directly ontoDisable Integrality

9. Check Your Antivirus Settings

As virtualization technology is increasingly being used to create multiple, isolated computing environments within one physical host machine, antivirus software can sometimes block virtualization features. This article will explain why and provide step-by-step instructions on how to check your antivirus settings which may be blocking VT-x from working in VirtualBox.

  1. Some third-party antivirus programs such as Avast can go to extreme lengths of security and block VT-x just in case a potentially malicious program wishes to use it for its purposes. As a result, you need to modify the settings of these antivirus programs so that they allow the correct activation of this hardware feature when required by VirtualBox.
  2. To do this, open up your respective antivirus application (in this example we’ve chosen Avast) from the Windows Start Menu or desktop shortcut then select the Settings/Protection tab and locate the Virus Shield submenu header at the top left corner foAvst main UI window
  3. Under the Privacy & Protection category scroll down until you find ‘Processor Assistant’ settings then click on it; here you should enable ‘Allow Pro Processor Instructions’.
  4. After making sure that all other options regarding the processor are enabled – restart your PC once again for changes setting made to take effect Alternatively if the steps above revealed no conflicting option disable the complete Real-Time Protection module or choose an alternative Antivirus provider like Kaspersky Total Security suite allowing more User Control over their system protection environment
  5. Once real-time protection modules are disabled – restarted the computer with prior mentioned alterations applied – try starting desired VM session once again overriding prior errors that came out after the selection of a particular snapshot

10. Disable Core Isolation From Windows Defender

Core isolation is a virtualization-based security feature in Windows Defender that helps detect low-level code injection and protect computers from malicious software. However, this advanced security feature clashes with some built-in software used to enhance hardware performance and optimize system processes. Thus, disabling Core isolation may help resolve conflicts with virtualization features like VT-x that have become more important for running virtual machines.

Here’s how to do it:

  1. Go to the Settings menu and open up Update & Security.
  2. In the left panel, select Windows Security > Device Security > Core Isolation Details > Memory Integrity
  3. Toggle off the Memory Integrity switch to disable Core isolation
  4. Restart your computer for the changes to take effect.
  5. Disable Hyper-V virtualization on your machine as it can conflict with VT-x on Windows 10 PCs
  6. Check your third-party antivirus settings and ensure that no active component is blocking or restricting virtualization features on your computer
  7. Run a command in the Command prompt if errors persist after following the above steps

11. Running bcdedit /set hypervisorlaunchtype off in Command Prompt

The specific command needed is “bcdedit /set hypervisorlaunchtype off” and should be entered into an administrator Command Prompt window. After entering the command, users should restart their computers for it to take effect.

It’s important to use caution when using Command Line Prompt since incorrect commands could potentially cause further damage that could render a computer unusable. Before entering any commands, double-check spelling and syntax to ensure the accuracy of the entered command – incorrect commands can lead to irreparable system failure or data loss. To avoid unintended consequences it is also recommended that users back up important files before attempting any changes via Command Prompt as a precautionary measure before completing troubleshooting steps.

It is also possible that this solution may not work for all users and additional troubleshooting might be necessary such as disabling Core Isolation from Windows Security if Hyper-V does not show under Device Manager or reinstalling or updating virtualization software such as Virtualbox etc. However, running this initial command can help resolve errors associated with VT-x on Virtual Box quickly without having to enter any complex settings which makes this an ideal first step.

Preventing VT-x Issues

To ensure a smooth and reliable experience, users should verify CPU compatibility before purchasing as well as regularly maintain their BIOS and CPU drivers.

Verifying CPU Compatibility Before Purchasing

The importance of CPU compatibility when it comes to managing virtualization cannot be overstated. A user must ensure that their processor is compatible with the virtualization software or hardware they are attempting to install, as incompatible CPUs can lead to issues.

To ensure the successful implementation of virtualization, users should use tools like CPU-Z and check the manufacturer’s website or other sources for any documentation regarding their processor’s compatibility with specific versions and types of virtualization software.

Some manufacturers also provide instructions online outlining how to enable VT-x from BIOS if needed.

Regularly Updating BIOS And CPU Drivers

BIOS and CPU drivers are essential components for running virtual machines through VirtualBox or similar applications. These updates provide security patches, bug fixes, and advanced features that may be required to keep your system functioning properly.

Not updating these can result in serious security vulnerabilities such as data breaches and malware infections as well as compatibility issues.

Therefore, users of virtualization software need to check with their manufacturer/software developer regarding if any BIOS or driver updates are needed and install them promptly; paying special attention to VT-x support whenever available.

Implementing A Regular Maintenance Schedule

This includes updating the BIOS, which can provide better compatibility across hardware and software components.

Additionally, regularly checking for updates of the CPU drivers can ensure that your system has adequate support from its processor to run virtual machines without any errors or warnings.

Furthermore, applying regular maintenance to all protection features such as memory integrity settings can help avoid any potential conflicts when running third-party virtualization software like VirtualBox.

Finally, staying up-to-date with antivirus updates will also help protect you against malicious files and threats that could disrupt your system while using a VM platform.


VT-x technology is essential for efficient virtualization, which makes it difficult to work with virtual machines when VT-x is not available.

In such cases, troubleshooting and updating drivers on the system can help resolve this issue. It’s important to verify CPU compatibility before purchasing hardware and also keep the BIOS settings up to date.

Memory integrity should be disabled in Windows Defender and HyperV feature also needs to be switched off for successful enabling of VT-x. The article laid down basic concepts as well as necessary steps that can be taken to resurrect your machine from any such error occurring due to VT-x unavailability.

Also See: Set CPU Priority to Prefer Foreground Apps on Windows 11/10/8.1


1. What is VT-x and why is it important?

VT-x (also known as Intel Virtualization Technology) is a set of processor instructions designed to improve the performance of virtual machines by allowing them to access specific hardware that may be running in an isolated space. As such, it’s crucial for certain applications or features requiring hardware emulation – like hypervisors, containerization, or some computer games – which can result in errors if absent from system setup/configurations.

2. What does VERR_VMX_NO_VMX mean?

VERR_VMX_NO_VMX indicates that either your system doesn’t have support for virtualization technology enabled (and must be enabled first before attempting again) or the current user permission settings aren’t compatible with VT-x instructions so this aspect needs amending appropriately too depending upon its cause.

I am a computer engineer holding a bachelor's degree in Computer Science, complemented by a Master's in Business Administration from University of Strathclyde, Scotland. I currently work as a Senior IT Consultant in Melbourne, Australia. With over 15 years of...