Just follow the steps below
How to Fix Bootrec / Fixboot Access is Denied Windows 10
The bootrec /fixboot access is denied error in Windows is a frustrating error that occurs when you are trying to troubleshoot your boot configuration data. If you are at this stage, your PC probably refuses to boot. That is a problem that you need to fix.
To resolve the bootrec /fixboot access is denied error, follow the steps below.
The error bootrec /fixboot access is denied can have several causes.
