Windows 10 Boot Error: Operating system wasn’t found [Updated 2022]


The dreaded “operating system not found” error message is one of the most frustrating things that can happen to a computer user. If you see this message, it means that your computer is having difficulty accessing its operating system, which prevents it from booting up properly. There are a few different reasons why this error might occur, but fortunately, there are also a few different ways to fix it. In this blog post, we’ll walk you through some of the most common causes of this error and how to fix them.

What are the causes of “Operating system wasn’t found” error message

There are a few different reasons why you may see the “Operating system wasn’t found” error message. One possibility is that your computer’s hard drive is damaged or has failed. If this is the case, you will need to replace the hard drive.

Another possibility is that the partition table is corrupt. The partition table is a map of where all of the data on your hard drive is located. If the partition table is corrupt, it can cause problems with booting up your computer. In some cases, you may be able to fix a corrupt partition table by using a Recovery CD or Recovery Partition. However, in other cases, you may need to use a software program to rebuild the partition table.

Finally, another possibility is that the boot sector is corrupt. The boot sector is a small section of your hard drive that contains information about how to start up your computer. If the boot sector is corrupt, it can prevent your computer from starting up properly. In most cases, you can fix a corrupt boot sector by using a Recovery CD or Recovery Partition. However, if these methods do not work, you may need to use a software program to repair or replace the boot sector.

How to fix the error “Operating system wasn’t found”?

For MBR:

If you’re having trouble booting into Windows, it’s possible that the Windows bootloader on your MBR disk is damaged. In this case, you’ll need to repair the bootloader to get things back up and running. The process is fairly simple and only takes a few minutes to complete.

  • First, boot into the Windows Recovery Environment.
  • Once you’re in the recovery environment, open the Command Prompt and enter the following commands:
  • fixmbr, fixboot, and Bootrec /rebuildbcd.

These commands will repair the MBR, fix the boot sector, and rebuild the boot configuration data, respectively.

After running these commands, reboot your computer and you should be able to boot into Windows normally.

For GPT:

If you find that the Windows bootloader on your GPT disk is not working correctly, you can use the Diskpart utility to repair it.

  • First, open Diskpart by typing “diskpart” at the command prompt.
  • Then, type “list vol” to see a list of all the volumes on your disk.
  • Next, type “select vol X” to select the volume that contains your Windows installation.
  • Finally, type “ren BCD BCD.bak” to rename the current bootloader files, then “bcdboot E:\Windows /l en-us /s M: /f ALL” to rebuild the bootloader files.

This should fix the problem and allow you to boot into Windows successfully.

If you are still unsuccessful, get in touch with a local computer repair technician.

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...