I have the same problome I got mines from EB's. But the no cd fix the problem and I beat the game.
Spoiler:
sorry to call on you again, but did you install thru Steam? also, where was the gamefix you got? i tried them on mine, but it didn't really work (still crashed on loading the final "mission"
P.S. Radkor: Id like to say what I am thinking right now in reference to IW and in reference to my game crashing, but it isn't exactly .... forum/website friendly...
[Edited by DeltaSniper001, 11/11/2009 9:06:10 AM]
perhaps your 'version' of the game has problems-
best,
Cal