Fix BOOTMGR is missing Windows 10 fix with USB

Fix BOOTMGR is missing Windows 10 fix with USB. There are quite a few causes of BOOT MGR errors, such as wrong files on the hard drive. to the USB ports on the computer.

USB Boot starts, please wait a bit:

Make it impossible for the computer to distinguish where the Boot partition is, or maybe you just upgraded the hard drive to spend multiple active partitions on the wrong partition =>> making the machine not bootable. There are quite a few reasons just like that?

This is a fairly common error while opening the computer, often appearing a black screen with words like:

BOOTMGR is missing 

Press Ctrl + Alt + Del to Reset 

The above screen appears telling us to press 3 buttons and then restart the computer?

but when booting up they will report the same error as above.

BOOTMGR is missing Windows 10 fix with USB
BOOTMGR is missing Windows 10 fix with USB

What is “bootmgr is missing”?

BOOTMGR, also known as Windows Boot Manager, is used to control the boot process of Windows. BOOTMGR helps to launch winload.exe when you start your computer to load the Windows operating system.

The error BOOTMGR is missing only occurs on Windows Vista, Windows 7, Windows 8, 8.1 and Windows 10.

On Windows XP this error does not occur. And now no one is using windows XP anymore.

Fix BOOTMGR is missing Windows 10 fix with USB

Windows Boot Manager or BOOTMGR is located in your computer’s operating system boot drive (mainly the C: drive). Bootmgr controls the startup volume that starts winload.exe when the computer starts to load windows that are pre-installed on the processor. In general, bootmgr is entirely responsible for starting your computer’s Operating System. Here are some working solutions for fixing missing BOOTMGR in windows 10.

Note: This fix works on all versions of Windows including Windows 7, 8 and 8.1, Windows 10.

Delete all connected media

If you plug in any external media like a USB Drive, your BIOS may load from the external device instead of the correct boot volume. So please remove all media connected to your PC.

Check Boot Order in BIOS

If After removing all connected media, the missing BOOTMGR error may still exist, Then you need to check the boot order in BIOS. To do this Press Ctrl + Alt + Del to restart your computer. While the boot window or the manufacturer’s logo pops up, keep pressing the specific key (usually F12 ) to enter the BIOS.

NOTE: The key to enter the BIOS can be F2, F8, F10, F12, Esc or Del, etc. If you are unsure, consult your computer manufacturer.

Here, switch to the Boot Tab using the Left and Right Arrow keys tab. Now In Boot tab, use ↑ or ↓ key to mark your correct boot hard drive. Then use the + or – key to move your boot drive to the top to be the first boot device.

After making changes Click F10 to save settings and exit BIOS. Then your PC will automatically reboot. Check if it can successfully boot into your OS. If not, try the next solution.

Run auto repair

Windows has an automatic repair tool inbuild to check and repair all startup errors that prevent windows from starting normally. Before performing any troubleshooting steps, we recommend that you perform a boot repair first. you can do this by following way.

First Insert the Windows 10 bootable CD or DVD and restart your PC. Note: If you do not have the Windows installation media, you can create one by following the steps below.

Now When prompted Press any key to boot from CD or DVD, click any key on the keyboard. Next choose your language and click Next. Click Repair in the bottom left.

Click Repair your computer
Click Repair your computer

This will restart windows, and on the next screen, select an option, click Troubleshoot and then click Advanced Options. This will display all the available Tools as shown below.

Now click on Startup Repair. This will restart windows and start the repair process. During repair, this will check the points below.

  • Driver is missing/corrupted/incompatible
  • Missing/corrupting system files
  • Missing/corrupt boot configuration settings
  • Registry settings are broken
  • Corrupt disk metadata (master boot record, partition table or boot sector)
  • Installing the update has problems

Wait until Windows Automatic/Startup Repairs completes. Then Reboot and you have successfully fixed the missing BOOTMGR error . If still getting the same error, skip to the next step.

Make the Windows partition work

The active partition is a partition in your computer’s hard disk, known as the bootable partition, that actually contains your PC’s Operating System. Usually, only one partition can be active at that time like the C: drive , which is mostly where our windows are installed. But sometimes that partition doesn’t work due to some reason. Let’s see how to react.

First, you need to Access Windows Advanced Startup options . Here you will get  Advanced Command option . When the command prompt opens, enter the commands below


This command will start the disk section utility in your command prompt. When diskpart starts up, you should be able to see a “ DISKPART >” sign on the left side of your command prompt.

list disk

This will list all the connected drives on your computer.

select disk 0

Note: Select the Hard Drive where your windows is installed

list partition

This command will show you all the partitions created in the disk that you have selected.

select partition 2

Usually we choose partition 2 because that’s our windows partition but it doesn’t prove that you will always need to choose 2nd partition because sometimes partition 1 can also be our windows partition. So select only that partition where your windows is installed.

Note: Never select 100 MB, 350 MB and 500 MB partitions.


That should make your partition work.

Repair/Repair boot files

After activating windows partition, Repair corrupted boot file to fix Bootmgr Error on windows 10 or windows 7 computer. Also, maybe your boot files have been corrupted by some software, virus or other Windows/Software update is installed recently and you better get it repaired ASAP.

Due to this Bootmg r Missing Error we cannot boot into windows. Again, we need to open the command prompt via Advanced Boot . Here on Advanced  startup screen , select Advanced Command prompt when command prompt appears, type below commands one by one and press enter key to execute the command.

List volume
The above command we perform to find out the drive letter of the installed windows. Here write down the drive letter where Windows is installed. give me its D drive. Now execute below commands to repair bootmgr. (Note: Replace D with your windows installed drive letter.)

 D: (Your Windows Drive Mail)
Bootrec /fixmbr 
Bootrec /fixboot
Bootrec /rebuildbcd

The above commands fix bootmgr. Now repair hard disk for Error by executing below command.
Chkdsk /f /r  Type this command and press enter key to fix hard disk errors and bad sectors.

After 100% completion of chkdsk command , just restart your computer, hopefully this time your windows starts up normally. If the same error persists, proceed to the next step.

Windows Image Repair

After doing the above methods Still not solving the problem then windows image repair can fix windows boot issues including missing bootmgr. you can do this by first opening Command Prompt and entering the following command:

DISM /Online /Cleanup-Image /RestoreHealth

Press enter to run the above command and wait for the process to complete, which usually takes 15-20 minutes.

NOTE: if the above command doesn’t work then try this: Dism /Image:C:offline /Cleanup-Image /RestoreHealth /Source:c:testmountwindows

Dism /Online /Cleanup-Image /RestoreHealth /Source:c:testmountwindows /LimitAccess

After the process is complete, restart the PC Check the problem is solved.

These are some of the best working solutions to fix Bootmgr Missing Boot Error on Windows 10, Windows 7 computers permanently. Have any query suggestions, please comment below. Don’t forget, click Like and Share if you find this content useful.

Ngolongtech hopes this article would help you!

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