W10 - "We can not log in to your account" - no access to files

Hey. From day to day, a message like in the picture started appearing from nothing after turning on the computer:

After clicking the logout button, I log out of the account and can try to log in again, but it's always the same. As I give up, I can use a computer but I do not have access to all my files.

I combined myself and so:
I can not restore the system because I do not have access to it.
I found on the internet to execute such commands on the command line:
dism / online / cleanup-image / restorehealth
sfc / scannow
The result in the screenshot below:

Of course, it did not help, the message pops up all the time.

I have one administrator account on my computer. Windows 10 was updated from Windows 7 and I did not set up any Microsoft account. The system is legal, of course. I'm writing this because I found some advice on the Microsoft account on the internet but I have no idea what it is. I did not have such an account.
I am asking for help, I urgently need access to my files.

By C: \ Users you are not able to get to the files of a given user?

Where should I enter it? I do not have my computer at all, or any files on my desktop other than shortcuts.

Press the Win (Windows logo) + r keyboard. In the window that pops up, enter C: \ Users and enter enter.

Through C: \ Users, I can get to files. Thanks.
But how to fix this problem? Any idea?

Try to scan the MBAM and ADWCleaner computer.

Have not you updated the system recently (before this problem)? Because there is already one identical case with this login. Is it the next Wt10 patch, how about DHCP?

Check for updates in Windows Update. It helped me some time ago ...