The Windows boot manager is actually a piece of small software that helps you load your system. It is part of the volume boot record, which is responsible for the boot process. If any problems are found on the Windows boot manager, you won’t be able to access your system or disk data. In this case, you need to find solutions to fix the error.

Windows boot manager, also called BOOTMGR, is located in the root directory and responsible for starting a system & interacting with users. The BOOTMGR configuration data is located in the Boot Configuration Data (BCD) store, which is a database similar to registry; it is used in new Windows system to replace the boot.ini file used in some old Windows like Windows XP.

Stay Calm When Windows Boot Manager Failed

When you find the Windows boot manager failed, please don’t panic. You should try the methods that will be introduced in the next part to fix the Windows boot manager error. To prevent the possible data loss resulted from the boot failure, you should go to the home page to get reliable data recovery software and backup program.

Windows boot manager failed

Error: Inaccessible Boot Device, How To Fix It Yourself?

Definitely, you are not able to enter your system when Windows Boot Manager is failed. You’ll probably see the following errors on the screen:

  • 0xc00000f
  • 0xc00000e
  • 0xc00000d
  • 0xc00000e9

What are the possible causes for a failed Windows boot manager?

In fact, the root reason is a corrupted Master Boot Record (MBR). What’s more important is how to fix when you find Windows boot manager not working.

How to Fix Windows Boot Manager Boot Failed

This part will show you how to fix Windows boot manager in Windows 10.

Solution 1: Make Use of Bootrec.exe Tool

  1. Restart your system and press F8 to see the Windows Recovery Menu.
  2. Select Troubleshoot.
  3. Select Advanced options.
  4. Select Command Prompt. (How to recover files using CMD?)
  5. Type bootrec /RebuildBcd command and press Enter.
  6. Type bootrec /fixMbr and press Enter.
  7. Type bootrec /fixboot and press Enter.
  8. Type bootsect /nt60 SYS (or bootsect /nt60 ALL) and press Enter.
  9. Wait for the commands to complete.

Command Prompt

You can also use the Rebuild MBR function in the bootable version of MiniTool Partition Wizard to try to fix the Windows boot manager error caused by damaged MBR.

Solution 2: Perform a System Restore

  1. Restart your computer and boot from the Windows installation disk.
  2. Choose to change language & other settings in Windows Setup or not; then, click Next.
  3. Click Repair your computer.
  4. Select Troubleshoot > Advanced options > System Restore.
  5. Choose the target operating system.
  6. Click Next in the System Restore wizard.
  7. Select the proper restore point and click Next.
  8. Confirm your selection and click Finish.
  9. Click Yes in the prompt window to confirm system restore.
  10. Wait for the restore to complete.
  11. Restart your PC.

confirm system restore

In addition, you can also try to fix Windows boot manager failed to start by removing newly installed hardware & external devices and then reboot.


The Windows boot manager file is very essential for the PC startup, so it is protected by the system (hidden and read-only). It is actually located in the root directory of the active partition. In most PCs, it has a System Reserved label. When it is damaged, you won’t be able to boot into the system. You must follow the solutions given above to try to troubleshoot Windows boot manager failed issue.

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