Thanks THX for trying to help But your first solution didn't help cuz whan I'm trying to untick the "Account is disabled" it says "Access is denied". now I'm going to try your second solution and see if it helps. I'll come back to inform you. Thank You! Ok, I'm back and yea it works!!!
and now I'm stuck. I cant install some programs or drivers because the Admin user is disable. I changed in the "control panel" my user to a "Standart User" and I used the "Local users and groups" to disable the Administrator account. How can I now get administration?