Fix it with Startup Repair and BootRec Commands
Once you have the command prompt up on screen, you will need to issue a set of commands to find and resolve issues that might be preventing your computer from booting.
Type BOOTREC /FIXMBR and hit <Enter>.
This command will attempt to fix any corruption issues with the master boot record.
If all goes well, you should see The operation completed successfully.
Next, type BOOTREC /FIXBOOT then hit <Enter>. This command will attempt to write a new boot sector on the hard disk if Windows detects damage. Usually, this happens in cases where an older version of Windows was installed or a non-compatible operating system such as Linux was installed.
If you are seeing an error such as Boot Manager is Missing, then the BOOTREC /RebuildBcd command might be able to fix it. This operation can also restore boot entries for older versions of Windows if you have a dual boot configuration.
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