What is BOOTMGR?
BOOTMGR is a file named Windows Boot Manager. The BOOTMGR can read the Boot
Configuration Data (BCD) and execute the winload.exe, then the winload.exe will load
the essential drivers to help your system start. It was first introduced in Windows
Vista to replace the NTLDR boot manager in previous versions of Windows like Windows
In most cases, the BOOTMGR file is located on System Reserved partition, if you don’t
have a System Reserved partition, the file must be located on your system partition
typically the C drive. In addition, you should be aware that the BOOTMGR file is
Why BOOTMGR is missing?
We found many people look for help in the forums like that “Today I turn up my Sony
laptop and try to boot from Windows 7, but it’s failed. An error message displayed
‘BOOTMGR is missing press Crl+Alt+Del to restart’ instead, I have no idea what
happened; I just installed some widgets on my desktop yesterday. What should I do?
Any help would be appreciated.”
Sometimes, you’ll get similar error messages like “Couldn’t find BOOTMGR”, “BOOTMGR
is missing press any key to restart”. If you encounter these error messages, don’t
be in a panic and we’ll help you work out this problem.
There are several reasons listed below for these BOOTMGR errors.
Your computer trying to boot from the external USB flash drive and there is
no BOOTMGR file on that device.
The boot sector or MBR on your system may be damaged or missing.
The BIOS on your computer is outdated.
Hardware upgrades issues.
BOOTMGR Is Missing: How to Fix?
To fix BOOTMGR is missing errors in Windows 7/8/10, we’ll provide a variety of
solutions to help you out.
Solution 1: Disconnect all external devices
Disconnect the external storage device, like USB flash drive, floppy disk or external
hard drive, etc. If suchlike devices aren’t bootable, you will get the BOOTMGR is
Solution 2: Check the first boot device
If your system hard disk isn’t the first boot device, you computer will boot from
other hard disk where has no boot files, then you’ll receive this error message
definitely. Please make sure the right hard drive is listed first in BIOS.
Solution 3: Upgrade BIOS version
An out-dated BIOS may result in the error message. Please upgrade motherboard’s BIOS.
Please make in mind for your current BIOS version and download the new version from
the manufacturer website, if you have anything problem, please consult your
Solution 4: Repair Boot Sector
In order to repair your boot sector, you need a Windows Installation disc. Get into
the start-up options, select “Repair your computer”, then you’ll get a list of
Windows systems installed on your PC, choose the Windows you want to repair. You can
fix the corrupted boot sector afterwards.
Solution 5: Rebuild MBR
The “BOOTMGR is missing” error message occurred to your computer probably due to the
corrupted MBR. Thus, you can rebuild MBR for your computer.
Rebuild MBR is easy to handle. There are two ways to choose, repair with command
prompt or repair with AOMEI Partition
Repair with Command Prompt
The first thing you have to prepare is a Windows Installation disc. Then boot from
that disc and enter system recovery options or repair your computer, and choose
command prompt. Next you can enter these commands in turn.
Rebuild MBR with AOMEI Partition
AOMEI Partition Assistant Professional is strongly recommended by Windows users due
to its powerful disk partitioning features and intuitive interface, which provides
main functions including migrate OS to
SSD, extend partition, rebuild MBR, create bootable media, NTFS to FAT32
converter, etc. To fix the corrupted MBR, we’ll introduce how to rebuild MBR for you
with the listed steps. Before that, you can take advantage of AOMEI Partition
Assistant to create a bootable
media with a normal computer (has the same Windows OS with your computer),
then boot your PC from the bootable media.
Step 1: Download AOMEI Partition
Assistant Pro, install and launch it. On the main console, select the system hard
disk and choose “Rebuild MBR”
at the left panel or right click the system hard disk and select “Rebuild MBR” at
the drop down menu.
Step 2: Select the MBR type for your Windows system, and hit “OK”.
Step 3: Click “Apply” to rebuild MBR.
Solution 6: Check errors for Your System Hard Drive
Another reason to this error message could be the bad sector on your system hard
drive. To test your hard drive whether has an error on it or not, you can check for
Step 1: run AOMEI Partition Assistant, on the main window, right
click on the system hard disk and choose “Surface
Test” at the drop down menu.
Step 2: Click “Start” to test errors.
Tips: you can tick “Quick Check” to test quickly.
Step 3: Press “Cancel” when the operation is done.
In addition, you could run “chkdsk C:\ /f /r” as well to check for errors.
With the help of AOMEI Partition Assistant, you can easily fix “BOOTMGR is missing”
problem. Besides, if the error still exists, your hard disk must be damaged and you
have to replace for another one. Please backup your system hard disk to another one
with “Disk Copy” feature.