bootmgr is missing and cannot boot

bootmgr is the abbreviation of boot management program, which is one of the key components for Windows operating system startup. When you start your computer, if a "bootmgr is missing" error message appears, it means that the computer cannot find the files required for startup. This problem can be caused by a variety of reasons, such as hard drive failure, corrupted boot files, or setup issues. Below we will explore possible solutions to fix this issue.

Solution 1: Check the boot device
First, we need to make sure that the computer is booting from the correct boot device. You can check the boot order in the BIOS settings to make sure the hard drive is the first boot device. If you're not sure how to enter the BIOS, you can try pressing the appropriate key that appears when your computer starts up (usually F2, F8, F10, or F12). Once in the BIOS setup, navigate to the boot options and set the hard drive as the preferred boot device. After saving the settings, restart the computer to see if the problem is resolved.

Solution 2: Repair the boot record
If the boot device is correct but the problem still exists, it may be because the boot record is damaged. You can use the Windows installation CD or USB installation disk to fix this problem. Insert the installation disk and restart the computer. After entering the installation interface, select "Repair your computer". Then select "Command Prompt" and enter the "bootrec /fixboot" and "bootrec /fixmbr" commands to repair the boot record. After execution, restart your computer to see if the problem is resolved.

Solution 3: Rebuild the bootmgr file
If the above method does not work, you may need to rebuild the bootmgr file. Again, you need to use a Windows installation CD or USB installation disk. After entering the installation interface, select "Repair your computer" and then select "Command Prompt". In the command prompt window, enter the following command:

attrib -h -r -s C: ootBCD
ren C: ootBCD BCD.old
bootrec /rebuildbcd

These instructions will modify the attributes of the BCD file, then rename it to BCD.old, and finally rebuild the BCD file through the bootrec instruction. After the execution is completed, restart the computer to see if the problem is resolved.

Solution 4: Use third-party tools to fix
If none of the above methods can solve the problem, you can try to use third-party tools to fix the boot problem. Tools such as EasyBCD and AOMEI Partition Assistant have the function of repairing boot records. You can download and install these tools and follow the instructions to perform repair operations.

Summary
The "bootmgr is missing" error is one of the common problems that causes the computer to fail to boot. By checking the boot device, repairing the boot record, rebuilding the bootmgr file, and using third-party tools to fix it, you have a good chance of solving this problem. If you are unsure of the steps or are not good at technical operations, it is recommended to seek professional help to avoid more serious problems. I hope this article will help you solve the "bootmgr is missing" problem!

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