Hey its me again. Right I got past the hacking computers part in the level, finally, and the same day I posted the question I had completed the whole game on EASY, at the end, cortez is dancing on the dance floor in the nightclub, (this is where the problem is) I pressed X and it went back to the story menu and stated that all the levels past the level i had a problem on were all locked!!! Has anyone else had this problem? and if so how did they solve it and do you have to do them all again? :( cheers once again.