Fix: Wdcsam64_prewin8.sys Core Isolation Turned off [2023]

Wdcsam64_prewin8.sys Core Isolation Turned off

Are you having trouble with WDCSAM64_PREWIN8.SYS Core Isolation turned off? Don’t worry — this issue is common and can be easily fixed!

With these steps, you’ll be able to get your system back up and running in no time!

Key Takeaways

  • WDCSAM64_PREWIN8.SYS is a common issue involving Core Isolation being turned off.
  • The issue can be fixed by removing the faulty driver and enabling Memory Integrity in Windows 11.
  • The faulty driver can be identified using the Device Manager utility.
  • Restarting the system after removing the necessary drivers can resolve the issue.


This guide will show you how to remove the faulty driver, wdcsam64_prewin8.sys, and any other incompatible drivers so that you can re-enable Memory Integrity in Windows 11.

If you’ve received a notification from Windows Security saying that Memory Integrity has been disabled due to an incompatible driver, then this is for you.

You’ll need to identify the faulty driver by using your system’s Device Manager utility and remove it along with any other incompatible drivers (if present).

To do this, launch the Device Manager and open up the System Devices section.

Once there, search for wdcsam64_prewin8.sys or any other suspicious-looking devices and right-click on them before selecting Uninstall Device from the menu.

When prompted with a confirmation window, accept it and restart your system after all of the necessary drivers have been removed.

This should resolve the issue and allow you to re-enable Memory Integrity in Windows 11.


If you’ve got any Western Digital hard disk drive or solid state drive, then you likely already have the driver installed on your PC. It is basically a driver from western digital technologies.

It’s an old driver that can be found in both Windows 10 and Windows 11 that is incompatible with the core isolation memory integrity.

However, it doesn’t serve any essential purpose for your system. Its absence won’t affect computer performance in any way.

At first, I thought deleting the driver might cause issues with my PC. I had a fairly old external hard disk drive from Western Digital Technologies. However, when I forcibly removed the driver anyway, everything worked fine. I was able to turn on Memory Integrity in my Windows 11 without a hitch.

It’s not essential to have this driver installed on your PC. If you’re looking to fix core isolation being turned off due to this file, simply delete it and everything should be OK!

WDCSAM64 PREWIN8.SYS Core Isolation is turned off? What Do I Do?

If this is the case, you’ll need to take further steps in order to get Memory Integrity back up and running.

To begin, try these:

  • Run a full system scan with your antivirus program to detect any malicious programs that may have caused this issue.
  • Update drivers for any hardware related to WDCSAM64_PREWIN8.SYS core isolation. This includes graphics cards, sound cards, and so on.
  • Restore Windows using an image backup if all else fails. This will restore your computer’s settings without having to reinstall the operating system from scratch.

What Causes The WDCSAM64_PREWIN8.SYS?

The causes of the error can include corrupt system files, corrupt drivers, and driver incompatibility issues.

Corrupt system files are likely to infect drivers, or the process responsible for Core Isolation may have become corrupted.

Alternatively, a driver might be outdated or otherwise corrupt leading to this issue.

Additionally, the version of the driver running on your PC could be incompatible with your operating system resulting in this same error message.

Fortunately, you can resolve this error by fixing any corrupted files and ensuring all drivers are up-to-date and compatible with your OS.

How to Fix Wdcsam64_prewin8.sys Core Isolation Turned off?

1: Attempt To Remove the Driver Using the DISM and PNPUtil Tool

To fix this issue, follow these steps:

  1. Remove the driver using the DISM and PNPUtil tool:
    • Left-click on the Start button.
    • Type Command Prompt.
    • Click the Run as administrator option.
    • Click Yes on the User Account Control (UAC) prompt.
    • Command Prompt will open.
    • Copy and paste this command: dism /online /get-drivers /format:table.
    • Press Enter.
    • Look for WDCSAM64_PREWIN8.SYS under the Provider Name table and take note of its Published name.
    • Enter this command: pnputil /delete-driver oem46.inf /uninstall /force (replace oem46.inf with your specific Published name).
    • Press Enter.
  2. Restart your computer to check if the error is gone. Memory Integrity should now be working properly again!

If you still experience issues after removing the driver from your PC, refer to our guide on how to fix Command Prompt not working.

2: Run SFC and DISM (again)

Now it’s time to move on to the third fix: running SFC.

The System File Checker (SFC) is a Windows built-in tool used for replacing damaged, lost, or changed system files with good system files.




Here’s what you need to do:

  • Open Command Prompt and type sfc/scannow then press Enter
  • Wait for the scan to finish
  • Check if the error has been resolved
  • If not, try another solution from this guide

3: Update the Wdcsam64_prewin8.sys Driver

You can try updating the driver to see if that solves the issue.

To do this, open the Run box and type devmgmt.msc then press Enter to go to Device Manager.

Double-click Display adapters to expand it and then find and right-click wdcsam64_prewin8.sys and choose Update driver from the list of options.

You’ll be asked how you want to search for drivers in a pop-up window; select Search automatically for updated driver software and follow the instructions to complete the process.

If this doesn’t work, you may need to remove and reinstall your display adapter or contact technical support for more help with fixing core isolation being turned off on your device.

4: Update Your Windows

Updating your Windows can help resolve the error message

To keep your system running smoothly, it’s important to install updates as they become available from Microsoft. This will ensure that all of the latest features and security patches are installed and running on your machine.




To update Windows, press the Windows + I key to open the Windows Settings app. From there, select Windows Update and click on Check for Updates to search for any new updates that may be available.

Updating your Windows will also fix bugs causing errors on your PC as well as resolve compatibility issues affecting drivers or other programs installed on your system.

Keeping up with updates is a crucial part of maintaining a healthy computer, so make sure you don’t neglect to check for them regularly!

Frequently Asked Questions

How Do I Know if Wdcsam64_Prewin8.Sys Core Isolation Is Turned Off?

Follow these steps:

  1. Open File Explorer and navigate to the System 32 folder.
  2. Look for a file named Wdcsam64_Prewin8.sys. If you see this file, it means that core isolation is still active.
  3. If the file does not appear in the folder, it’s likely that core isolation has been disabled.

To ensure that core isolation is disabled, do the following:

  1. Right-click on the Start button.
  2. Select Settings.
  3. Go to Update & Security.
  4. Click on Windows Security.
  5. Choose Device Security.
  6. Click on Core Isolation Details.
  7. Verify that Memory Integrity is set to Off.

Is There a Way to Prevent It From Being Turned off in the Future?

Yes, there is a way to prevent it from being turned off in the future.

You can adjust your security settings so that Core Isolation remains enabled.

This will ensure it isn’t disabled unintentionally or by malicious software.

To do this, go to the Windows Security Center and select ‘Change Security Settings.’ Then look for the Core Isolation option and make sure it is selected.

Save your changes and you’re done!

What Other Fixes Can I Try if the Ones Listed in the Article Don’t Work?

If the fixes listed in the article don’t work, there are still other solutions you can try.

For example, you could uninstall and reinstall any antivirus software on your computer.

This may help remove any malicious files or programs that have caused this issue.

Additionally, you could check for Windows updates to ensure your operating system is up-to-date.

Does Core Isolation Need to Be Turned on for My Computer to Run Correctly?

Yes, Core isolation should be turned on for your computer to run correctly.

This is because the core isolation feature helps protect your computer from malicious programs and other threats that could possibly damage it.

Without this feature enabled, your system could be at risk of becoming infected or experiencing other issues such as data loss or crashing.

Therefore, it’s important to make sure that you have this feature enabled in order to keep your computer running smoothly and securely.

Is This Issue Specific to Certain Versions of Windows?

Yes, this issue is specific to certain versions of Windows.

It affects Windows 8.1 and earlier operating systems, as well as some editions of Windows 10 and 11.

If you’re running one of these versions, it’s likely that your computer requires the Core Isolation feature to be turned on for proper functioning.

It’s important to ensure that you’re running the correct version of Windows so that your system can work correctly.


Don’t worry – there are several fixes you can try!

Start by removing the driver using the DISM and PNPUtil tool.

Then, update the driver.

Next, run SFC to check for any corrupt system files.

Finally, update your Windows version.

If all else fails, contact a professional for assistance.

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...