I think my computer has been infected with a kind of virus or malware.
Yesterday I locked my windows and went out of house, at return as I tried to use it again it asked for a password!
(I'm pretty sure that I didn't set it). So I tried some passwords but none of them worked. So I put a windows 7 installation disk into my computer and did some none sense things. Finally I restarted my computer and it offered to repair the windows, I chose this option and it logged me in finally (without any user/pass required). Obviously I thought that was trivial and after a while I locked it again and now it asks me for password again!
Fortunately I've created another user with administrator privileges but I cannot reset the (unset!!!) password of the main account, It says "Access is denied".
Interestingly as I restarted the computer and wanted to log in with my new account it asked me for both username and password!!!! (I've never seen such a thing), even the picture of the account was missing, but fortunately I remembered them.
Any ideas?
sfc /scannow
in a command prompt to check for corrupted system files.SFC /scannow
.