Boot computer from Windows installation media, click on the “Repair your computer” and then “Troubleshoot” option to access Windows 10 boot options.Īfter getting into the 'Advanced options' screen, click on 'Command Prompt' to launch it.

Repeat this operation 2-4 times and Windows will open up boot options for you. To access Command Prompt in Windows RE mode, you can try the below 2 ways: Restart the Windows and as soon as you see the Windows logo press and hold the power button to force shutdown it. If you don’t have Windows CD, you can turn to the second method. If you can access Command Prompt in Windows RE mode (with using Windows installation media), choose the first one to repair MBR via Command Prompt. To repair damaged MBR in Windows 11/10/8/7, you can try the following two methods. Usually, the MBR problem might be caused by malware infection, or improper shutdown. If you receive any of these errors, you need to fix MBR in Windows 11/10/8/7 to get rid of the boot issues. Once the MBR file is damaged or inaccessible, you may not be able to boot your system at all, and error information as ' Operating System not found', 'Error loading operating system', 'Missing operating system' or 'Invalid partition table' will show up. MBR will be created when the first partition on the hard drive is created and it is a very important data structure on the first sector of disk, which contains the partition table for the drive as well as a small amount of executable code for the boot start. Master Boot Record (MBR) belongs to boot record, along with Boot Configuration Data (BCD).

Fix grub windows 10