The issue that I have is when I set up a game, it will run fine for about 5mins or so and then crash with a interesting graphical 'haze' all over the screen. Restarting cures this.
I've kept an eye on my temps - Q6600 @ 55 deg, GTX280 @ 70 deg - haven't had any problem prior to ab few weeks ago.
I can't see anything in Event Viewer to cause such an issue.
Doesn't seem limited to any specific games as some I could play fine previously are now bung.
Rig as follows:
Q6600 @ 2.4
Xfx GTX 280
8GB Corsair XMS2
Primary HDD - Western Digital 320GB