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 XP.
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 read-only.
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The BIOS on your computer is outdated.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 missing error.
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 manufacturer.
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 Assistant Professional.
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 Assistant
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 this.
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.