Well it had vista black on it but he decided he wanted to start over so he tried to install his copy of vista home and that did not work so he tried to install xp which worked. Then he tried to install vista black and that worked. Then while he was trying to install call of duty world at war it froze in the middle. Then he restarted and got it to run. Then whenever he tried to install a patch it froze in the middle of it and said it could not find a legal copy of the game and he said it is legal.