I have heavily customised my windows and my firewalls were down, I had taken ownership of some files and in that process some virus got itself stuck onto System32/logonUI.exe
I was unable to use defender as every option was greyed out.
Every time i logged into windows the process ran itself.
Tried booting Windows Defender Offline but it gave BSOD.
Tried sfc scan and it showed that windows was unable to restore some files for which integrity check failed.

On restart i was unable to login as I was sent back to password screen right after giving a password.

Fixed it using safe mode and blanking password through net user.

Had a very deep sleep after cracking it.

Can't you go into some kind of different cli/tty/interface thingy where you can pretty much become root and solve the problem without needing to login through the "official" login screen on windows? (genuine question)

@linuxxx Didn't think of that. It would have been difficult to connect with windows while its authentication process was fucked up.

The problem appeared once again when i updated from win 1803 to 1809 build last night.

This time I had no password and hence i was seeing those revolving beads with welcome text underneath.

Guess what, only way to boot into safe mode is to either use a recovery media or press restart button while holding shift key when you are on lock screen.

I had no recovery media at the moment and i was stuck at welcome loop so i could not click restart while holding shift.

I had to forcefully shutdown PC while it was loading windows so that it could start automatic windows recovery and ask me about safe mode or something.

Thus way I entered safe mode. Login worked. Rebooted and I was able to enter my PC.

@fahad3267 Oh no I meant more like, does windows have something like this at all/as well? I'm used to this when I'm 'fucked' :)

Yes windows has something like that but a lot of functions in Windows are built in complex way to perform complex functions and hence when one complex function is down. While windows is down

On the contrary Linux uses piped basic functions to achieve same kind of complexity hence that can be device or a workaround is possible.