Once you complete the steps, the Master Boot Record will now be repaired and Windows 10 should once again load normally. Press Y to confirm adding Windows 10 to the list of the bootable operating systems on the computer.Ĭlick the “X” button to close Command Prompt. While in the Command Prompt using the recovery environment, type the following commands and press Enter (on each line): BCDedit /export C:\BCD_Backup If troubleshooting the “Bootmgr Is Missing” error and rebuilding the BCD store does not fix the problem, use the following commands to export and erase the BCD store and use the RebuildBcd command again to fix the Windows 10 process. Use the RebuildBcd option when you don’t have another option, and you must rebuild the BCD (Boot Configuration Data) store: Bootrec /RebuildBcd This option will scan all drives to find all compatible installations, and it will display the entries that are not in the BCD store: Bootrec /ScanOS Use the ScanOS option when the Boot Manager menu does not list all the operating systems installed on the device.
Use the FixBoot option when the boot sector was replaced with another non-standard code, the boot sector is damaged, or when you installed an early version of the operating system alongside another more recent version: Bootrec /fixBoot This command will not overwrite the existing partition table in the hard drive: Bootrec /fixMbr Use the FixMbr option when you need to repair Master Boot Record corruption problems or when you need to clean the code from the MBR. The Bootrec.exe tool supports many options depending on your situation. In Command Prompt, you can use the Bootrec.exe tool to repair the Master Boot Record on Windows 10. Check your manufacturer’s support website for more specific instructions.Ĭlick the Next button in the Windows 10 Setup.Ĭlick the Repair your computer button from the lower-left corner. However, the process is usually different per manufacturer and device model. Quick tip: The process to change the settings for the Basic Input Output System (BIOS) or Unified Extensible Firmware Interface (UEFI) usually requires pressing one of the function keys (F1, F2, F3, F10, or F12), the ESC or Delete key.
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