Windows 10 is over... What to do?

Question

Windows

I added a second user to the system and prohibited him from all operations with my account folder. Reading, writing... Everything. Quietly switched, rebooted. Turned on the computer the next day. The entire interface from the welcome screen restarts endlessly. I can't enter a password the window changes endlessly from a background with a clock to a solid color fill of the interface.
The field with the password does not have time to be displayed, the list of accounts. Records too, I can not reload with pressed shift. The window that opens when you click on the shutdown icon immediately closes. With the help of a flash drive and writing bcdedit /store s:\boot\bcd /set {bootmgr} displaybootmenu yes bcdedit /store s:\boot\bcd /set {default} bootmenupolicy legacy finally entered the account. Record. Since the login screen became adequate and I could enter the password (the second account is really not there, but at least I went into my own) for 10 minutes it opened the desktop and ... Everything flickers. It's like a second of launch when the start menu appears and some elements loop endlessly. Or how would explorer open and crash in half a second. It's in safe mode... What can I do?
https://youtu.be/WSg48---474

Answer 1

Enter safe mode and demolish the second user.

Answer 2

Use a restore point to roll back to a time when the system was working fine