Graphic card runs at about 55 degrees C, CPU is at about 60 degrees C, system as a whole is about 30 degrees C.

These are the specs that Quake 4 choose for me, but it also crashes out if I play less demanding games like the original half life. I last went in my PC yesterday to check everything was in order, everything seemed to be fine. It also crashes out if I lower the specs and sometimes before the game has got past the loading screen. This is what made me think it was more likely to be a driver or other software issue.

Thanks for the help as this is a really annoying problem as I love playing games, nothing better to relax to then a load of mindless violence.....