Hi, I'm Ana M., an Independent Advisor. I would love to help you today.
Try entering Safe Mode to repair Windows.
Check this link in the Option (From a black or black screen)
https://support.microsoft.com/en-us/windows/sta...
If you can't restore Windows after performing the previous steps.
You can repair Windows download the ISO:
I recommend you borrow a PC to create a USB to repair Windows
Microsoft Official Website to download and create Windows 10:
https://www.microsoft.com/en-us/software-downlo...
https://www.ubackup.com/windows-10/reinstall-wi...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.