|Like Gopher said, overheating wouldn't really affect performance that much. |
The Pentium 4 is a pretty terrible processor, even though it has a 2.8 GHz clock speed it is only single core.
"...I've used Windows XP and even Windows 7 on this computer previously..."
So, what have you changed since then?
Only some major hardware difference would cause this big of a performance hit on the same OS, though I'll admit I have a little trouble believing that this thing was ever able to run Win7 in the first place...
Could you give us the exact specs of the RAM, Mobo, GFX, etc.?
Though I doubt any of these going bad would cause poor performance, mostly just system instability.
And this is a totally clean install, with no programs yet?
User Info Page Biography for full specs.