I know it looks unreal - disabling admin account in local user - but I was trying something as standart user. I normally use admin account, so I know password. So when in standart user I was playing with security rights or what ever it is called, UAC asked me for admin password and after that I (still dont know how) disabled admin account.
But now everything works. I went to safe-mode, to my suprise there was option to log in as ALREADY DISABLED adminnistrator account. So I logged in and enabled
So problem solved.
P.S.: sorry for my grammar, hope you can understand.