Sometimes, you might meet the “BOOTMGR is missing” error message during starting Windows 11, 10, 8.1, 8, or 7 computer. Don’t Worry and here we tóm tắt 6 workable solutions lớn dealing with the BOOTMGR errors in Windows computer.
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What is BOOTMGR?
BOOTMGR is a tệp tin named Windows Boot Manager. The BOOTMGR can read the Boot Configuration Data (BCD) & execute the winload.exe, then the winload.exe will load the essential drivers khổng lồ help your system start. It was first introduced in Windows Vista to lớn replace the NTLDR boot manager in previous versions of Windows like Windows XP.
In most cases, the BOOTMGR file is located on the 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, and cannot be modified.
What is the cause of Bootmgr is missing?
We found that many many users look for help in the forums lượt thích that “Today I turn up my Sony máy tính xách tay and try to boot from Windows 7, but it’s failed. An error message displayed ‘BOOTMGR is missing press Crl+Alt+Del khổng lồ 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.”
Besides, there are some similar error messages lượt thích “Couldn’t find BOOTMGR”, “BOOTMGR is missing press any key khổng lồ restart”. So, what causes such boot error messages? There are several reasons listed below for these BOOTMGR errors:
• Youaretrying to lớn boot the computer 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• The BIOS on your computer is outdated.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 lớn fix it?
Solution 1. Disconnect all external devices
Disconnect the external storage device, lượt thích USB flash drive, floppy disk or external hard drive, etc. If such likedevices aren’t bootable, you will get the BOOTMGR missing error.
Solution 2.Check the first boot device
If your system hard disk isn’t the first boot device, your computer will boot from another hard disk that has no boot files, then you’ll receive this error message. Please make sure the right hard drive is listed in the first place in the BIOSboot order.
Solution 3.Upgrade BIOS version
An outdated BIOS may result in an error message. Please tăng cấp the motherboard’s BIOS. Please make in mind your current BIOS version and download the new version from the manufacturer"s website, if you have anything problems, please consult your manufacturer.
Solution 4.Repair Boot Sector
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 danh mục of Windows systems installed on your PC, choose the Windows you want to lớn repair. You can fix the corrupted boot sector afterward.
Solution 5.Rebuild MBR
The “BOOTMGR is missing” error message occurred lớn your computer probably due khổng lồ the corrupted MBR. Thus, you can rebuild MBR for your computer.For this task, you can use the Windows installation disk and enter WinPE mode to lớn rebuild it via Command Prompt, or directly use a professional MBR repair tool. See more details below and choose a proper method based on your situation.
5.1. Repair MBR with Command Prompt
The first thing you have lớn prepare is a Windows Installation disc. Then boot from that disc & enter system recovery options or repair your computer, và choose command prompt. Next, you can enter these commands in turn.
• bootrec /fixmbr• bootrec /fixboot• bootrec /scanos• bootrec /rebuildbcd
5. 2. Rebuild MBR with AOMEI Partition Assistant
If you don’t keep the original Windows installation truyền thông any longer, or running such commands is complicated, you can use the powerful MBR repair tool: AOMEI Partition Assistant Professional. It comes with the “Rebuild MBR”feature lớn help Windows usersfix the corrupted MBR. Before trying to fix the “BOOTMGR is missing”error with the feature, you needtocreate bootable mediavia the software.The specific steps are listed below:
Step 1.(DownloadAOMEI Partition Assistant Prodemo version).Install và launch the software on another working computer.Connect an empty USB drive khổng lồ it.On the central console, click “Make Bootable Media”and follow the subsequent prompts lớn make a bootable USB drive.
Step 2. Connect the bootable USB device (it will contain the pre-installed AOMEI Partition Assistant Professional) khổng lồ the computer with the “BOOTMGR is missing”error and boot the computer.
Step 3. Once booting into the system, the AOMEI Partition Assistant software will be running automatically. Select the system hard disk and choose “Rebuild MBR” in the drop-down menu.
Step 4. Select the MBR type for your Windows system, và hit “OK”.
Step 5.Click “Apply” > "Proceed" khổng lồ rebuild MBR.
Solution 6. Kiểm tra errors for Your System Hard Drive
Another cause ofthis error message could be the bad sector on your system hard drive. To kiểm tra your hard drive whether has an error on it or not, you can use the previous AOMEI Partition Assistant Professional, too.
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 chạy thử errors.
Tip: you can tick “Quick Check” to test quickly. Press “Cancel” when the operation is done.
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To sum up
With the help of AOMEI Partition Assistant, you can easily fix the “BOOTMGR is missing” problem. Besides, if the error still exists, your hard disk must be damaged và you have lớn replace it withanother one. Please backup your system hard disk to another one with the “Disk Clone” feature.