I know what I'm supposed to do in the missile base(I have the book)but my problem is that the door to missile launcher room won't open like it's supposed to.I talked to the guys on the observation deck. When I try to get in that room the door don't open. If I use the gameshark and walk through walls, the missile is in place. I go cause the black out and when I go by the door the guy comes out to ask for help moving the missile into place but what happens is he gets stuck walking in place without saying anything and so do I. Is it because I started out I had disc 1 of the original (black label) version but disc 2 was from the greatest hits version?