Was playing Fallout for 93 hours constant and I just got to level 23 and it crashed out in the point where some guy is telling me thanx over the tannoy and get to the viewing platform to watch them take off in their rocket, so as I go back up the tunnel it just freezes, I went back to the previously saves bit and it worked but I lost the ability to see all places on the map which I had just saved so I redid loads and then I was in the wastelands killing off loads of kazas that fly at you with this magic wand I found and it froze again but this time it had to be reset back to before the tunnel so I lost 3 level ups and loads of hours, my question is "if I go on from here and get to about 80% of the game and it crashes again will I have to reset it from the tunnel bit again"? Do you think I should take the game back and get another copy or do it all again? You know how hard it is to start from scratch after so long and whats stopping it doing it again?

I'm thinking another copy of the game might right it, any suggestions most appreciated