If you're ok with data loss then you can:
a) Clean install
https://www.tenforums.com/tutorials/1950-clean-install-windows-10-a.html
b) Reset remove files:
https://www.tenforums.com/tutorials/4130-reset-windows-10-a.html
If you want to try again to save files then you can:
c) Windows refresh
https://www.tenforums.com/tutorials/4090-refresh-windows-10-a.html
d) Custom install
https://www.tenforums.com/tutorials/120352-custom-install-windows-10-a.html
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Please remember to vote and to mark the replies as answers if they help.
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