Strange, you shouldn't really have any issues running this. But from what I hear, other people are having optimization issues. Try finding one of those threads and go from there.
P.S. Extra 4 gigs of ram?
1. Like the guy said above, its 32-bit so it can't even go above 4 gigs.
2. This game wouldn't even go beyond 4 gigs of ram even if it could, in fact. I doubt it even uses 4. (I said doubt, not confirming. But I've never seen it use 4. Never.)
3. And recommending a Gtx 460 just to run this game? I don't even know where to start with that lol