I played through the tutorial just fine. Took about a week. Now, I go to load a custom single player match, and it force quits itself during the loading screen. I've tried several different set ups to see if that was it. No dice.
edit: Computer info -
Core i5 | P55 UD3L mobo | Palit nVidia GTX 260 OCZ 2x2GB DDR3 | WinXPSP3
edit: Computer info -
Core i5 | P55 UD3L mobo | Palit nVidia GTX 260 OCZ 2x2GB DDR3 | WinXPSP3