PSU wont cause the processor to overheat (not directly anyway) but then yours is really pansy...

deffo look at replacing your processor fan or at least cleaning/checking it...

do you have any extra case fans? or do you just have the one built into the PSU?

you'd be SHOCKED at the difference between a £5 crappy CPU fan and a pukka 50quid jobby! :eeek:

also i presume your GFX card has its own fan too yeah?