However, there are a few ways that you can use to try and fix this problem on your own. Listed below are the three most effective solutions that you can use to try and fix the “Bootmgr is missing” error and regain control over your computer and the ability to boot into your Operating System. It should be noted that, in order to boot from media such as a CD, DVD or USB, you may have to access your computer’s BIOS settings on startup (the process for which depends on the make and model of your computer) and change its boot sequence as per your needs. If you don’t know how to create the repair media, see steps here.
Solution 1: Repair your computer using Windows installation or recovery media
Insert a Windows installation media or Windows recovery/startup repair media for the version of Windows your computer is running on into your computer, restart your computer and boot from the media.
If you inserted an installation media, boot from it, select your language and other preferences and click on Repair your computer instead of Install now. If you inserted a recovery/startup repair media, skip this step.
Select which Operating System you want to repair and click on Next. If no Operating System is listed, just click on Next.
You will be met with the System Recovery Options In this dialog, click on the Startup Repair option.
Run the startup repair and it will detect and try to fix the “Bootmgr is missing” issue. When the startup repair utility asks you to reboot your computer, reboot it and then check to see if the issue has been fixed. If the problem has not been fixed, move on to the next solution.
Solution 2: Rebuild MBR, BootDOTini and Set C as Active Partition
The “Bootmgr is missing” error can also be caused on any and all versions of the Windows Operating System when your C drive (or basically the drive that has your installation of Windows on it) is not active. This is the reason why activating the partitions of their hard drive where they installed Windows managed to fix this issue for a more than significant percentage of Windows users who suffered from it in the past. see complete steps here.
Solution 3: Fix the issue using a Command Prompt
Follow all of the steps you did in Solution 1 until you reach the System Recovery Options On the System Recovery Options screen, click on Command Prompt. One by one, type in the following commands into the Command Prompt, pressing Enter after typing in each one to execute it: Close the Command Prompt, remove the installation or startup repair media from the computer and restart the computer. When the computer boots up, check to see whether or not the issue has been fixed. If it hasn’t, try the next solution.
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