I don't really have stuttering but what I do have is my screen will revert to desktop for about 2 seconds then go back into the game. Very strange. Never happens on my laptop, just my desktop running a GTX9800. Older card yes, but it runs the game well.
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*EDIT*
I hope I'm not breaking a rule...I legitimately have an extra copy that I'm trying to get rid of. I don't want to waste time with Ebay if I can.