Format?
But formatting a hard drive erases everything.
Isn't the OS on the mobo? I might be wrong, but other then that, you can manually delete or buy a new hard drive.
No, OS's are installed on the hard drive.
That's the thing, there is so much junk it would be better to just format it somehow and keep the OS.
So using some compressed air i dusted the forget out of my computer, and now my games run at 68c -ish. Using two monitors, game on one and browser/steamstuff on the other, is that an ideal temp?
That second monitor has no effect on temperature,
that temperature should be fine for your computer though.
Did some research, why don't you just reinstall your Windows? As far as I seen it's fine to reinstall the Windows as many times needed on the same PC.
System restore might do the trick.
Where do I find that on windows vista?