DarthEmpress Are you seeing BlueScreens while you play? Your dxdiag is full of them, so much so that everything else has been crowded out aside from one serious but non-BSOD error that points to a possible hardware issue. The BSODs could be hardware-related as well.
I can get some more info and try to figure this out, but it may be better to have the computer examined in person. Do you have a local shop that would do some testing for free or a low price? If this is a hardware issue, the only definitive test is to replace the component and see whether that fixes things. In-person testing can also include live debugging that's not feasible in a forum environment.
If this isn't a possibility, that's okay, I'll still do what I can. Just let me know.