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if you hold the shift key down while clicking on restart it will give you some recovery options
if necesary you can do this from the sign in page before you sign in.
you can try running it in safe mode or the repair option and see if that works.
i also have a way to make a win 10 boot disk that you can use to reinstall it totally if necessary. but please let me know if one of the above methods works for you first.