Hi- I've been playing Fallout 3 for a little while now, and I recently ran into a game-ending error. I'm in Project Purity, just as the Enclave soldiers come and confront the father. At first I was able to watch the scene in which he overloads the equipment, but then when I followed Doctor Li out of the Rotunda, my game froze. This is the first time this has ever happened to me, so I turned off my console, turned it back on, hit continue, and encountered the same error again. I tried multiple times, always encountering the same error, so I decided to just load from a little while back and begin performing the set up tasks over again. However, again, once the Enclave arrived, I was able to get back into the sub-basemant and take care of the one soldier, but when I went up the stairs and opened the door to the gift shop, the game froze. It happened time and time again. I tried blowing myself up and then doing it, resaving and doing it, I even brought in my disc as being faulty and exchanged it for a new one. However, this solved no problems.
What should I do?