Windows 10: win10 login screen saying "welcome" then saying " incorrect password"

hi, my girlfriends computer recently locked her out, we where ****ing around with trying to delete the windows.old folder after a recent update(wouldn't let us because of missing ownership) so she logged out and when she wanted to login again then it would say "welcome" for around 10-15sec and then say " incorrect password" and now we are stuck at this not knowing what todo. we've tryed to boot it into safe mode, but that requires a password today, the recovery, go back to previus state, opening cmd, basicly every option requires a login(wich again is not possibel) so anyone who have any suggestions?

:)

 

Password says The paramenter is incorrect.

Hi,

Thank you for posting the query on Microsoft Community.

I appreciate your interest on Windows 10.

I understand your concern and will help you with the issue.

I suggest you to follow the methods:

Method 1

Please follow the steps below to go back to the normal startup:

• 
  Type windows + r to open run command.
  
• 
  Type msconfig to open system configuration.
  
• 
  Uncheck the safe mode.
  
• 
  Then restart the computer and check.
  

Method 2

I recommend you to follow the article and check if it helps::

Password says The paramenter is incorrect.

Please get back to us with the updated status. WE will be happy to assist you further.

 

Can't login to my Windows 10 computer - incorrect password is correct.