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Table of Contents
1. Check the order of starting devices
2. Repair the boot using the installation media
3. Check whether the hard disk is abnormal
Home System Tutorial Windows Series How to fix 'BOOTMGR is missing' error?

How to fix 'BOOTMGR is missing' error?

Jul 24, 2025 am 02:08 AM

The "BOOTMGR is missing" error is usually caused by an incorrect startup sequence or a corruption of the boot file. The repair methods include: 1. Enter the BIOS to ensure that the hard disk is the first boot item and unplug the external device; 2. Use the Windows installation media to execute the bootrec /fixmbr, bootrec /fixboot and bootrec /rebuildbcd commands to repair the boot; 3. Check the partition status through diskpart, run chkdsk /f /r to fix the hard disk problem. If it is invalid, you may need to reinstall the system or replace the hard disk.

How to fix \

"BOOTMGR is missing" is a common Windows startup error that usually occurs when the computer is powered on or loaded. This problem is generally not caused by hardware failures, and can be fixed in most cases through a few simple steps.

How to fix

1. Check the order of starting devices

The most common reason is that the device that is preferred to boot in the BIOS/UEFI settings is wrong. For example, if you plug in a USB drive or a mobile hard drive, the system may try to boot from these devices, but if the boot information is not found, an error will be reported.

  • Enter BIOS (press F2, F10, Del or other specified keys when powering on)
  • Find the Boot tab
  • Make sure that the hard drive (such as Windows Boot Manager) is the first startup item
  • Save and exit

Unplug unnecessary external devices and try restarting, and the problem is often solved.

How to fix

2. Repair the boot using the installation media

If the startup sequence is OK or there is an error, it may be that the boot file is corrupted or lost. At this time, you can use Windows to install USB disk or CD to repair:

  1. Insert the installation media and boot from it
  2. Select the language and "Next" and click "Fix Computer"
  3. Select "Troubleshoot → Advanced Options → Command Prompt"
  4. Enter the following command in turn and press Enter:
     bootrec /fixmbr
    bootrec /fixboot
    bootrec /rebuildbcd

These three lines of commands repair the main boot record, write the boot sector, and rebuild the BCD (boot configuration data). Exit and restart when finished.

How to fix

3. Check whether the hard disk is abnormal

If the above method is useless, there may be some problems with the hard disk itself, such as the partition table is damaged or the system partition is deleted by mistake.

  • You can run diskpart at the command prompt to view partition status
  • Ensure that the system partition exists and is marked "Active"
  • If the hard drive has bad channels or file system errors, you can try using chkdsk /f /r to check for repair

This type of problem is relatively rare, but if none of the previous methods work, you may need to consider reinstalling the system or replacing the hard drive.


Basically these common solutions. Most of the time, you can confirm the startup sequence first, and then repair the boot. The key is to have a Windows installation disk backup, otherwise you can't even enter the command prompt.

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