Do you mean he actually switches the computer off by turning off the mains switch??? Kick his ass for me, and tell him that unless the comp is frozen (in which case you press the Shut Down button on the case, or if you don't have one, the Reset button) you should *always* use Start>Shut Down to turn off the comp, otherwise it can be damaging.
There could be a different reason of course, but the bad shutdowns are the most likely option. The cards aren't perfect for UT2004 but the game shouldn't actually break them (unless they have the worst cooling ever).
tezzanatori get a nice steady 40fps on my ati :) (dunno if that is good or not)
That is a good FPS. Is that the FPS in ut2004?? If yes, how do you show it?