Dude , do you have 2 , 256 ram sticks or just 512 ? I know it sounds nuts but my computer refuses to accept anything over 256 its brand new anything over 256 any 3d at all will make it lock up this might not be your case. Hard to honestly tell what the problem could be, most people would say its your video drivers but it can be anything from your cpu to your ram to your hard drive. I spent 2 months on a 1ghz dell when it first came out the entire thing broke lol 2 months man and the main problem was the cpu it would lock up almost immediately into a game or even loading . Computers are cool till they mess up huh.
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