overheating?!?! give fans a good blow out,
he may have more frames, but wot settings is he using , both grx card related and lfs.
tried rolling back the system to when it was working ok?, knowing vista its some sort of 50% cpu hogging search gadgetythingymajig that took 30mins to auto update on startup when u really needed to get on the computer quick.
wipe it, and stick xp on it!