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#61
Power off then power on and as soon as you see the Microsoft icon power off. The timing is critical.
Repeat: power on and as soon as you see the Microsoft icon power off.
Repeat: power on and as soon as you see the Microsoft icon power off.
Either the 2nd or the 3rd time if you see "diagnosing your PC" allow it to advance to the windows recovery or advanced troubleshooting menu.
There you should have options for:
reset with save files
reset with remove files
restore
startup repair
startup options
command prompt
etc