Ok.... looking at the specs, there shouldnt be any hassles.... but there is one other thing that you can try.....
See what resolution you are running in windows, and make sure that it set to 16 bit (just to test this). When you run the configuration of the game, set it to the same resolution as windows.... and take fog out.... FSAA set to 0.
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See if it still crashes.... A few people reported crashes when the computer changes resolution on either starting or exiting the game....
did you run spybot??? did you check for errors? and then fixed them???