Have you run virus checks, Spyware checks, Hijack This, Registry cleaners, etc?
My "Computer Savvy" friend (I use 'savvy' very loosely), had a problem with his PC - Every time he'd right click on a folder, it would crash explorer.
Instead of running any checks, he wiped his harddrive and reinstalled windows. Come a week later when he needed his Uni work, he realized "Oh, I forgot to backup".
The same problem popped up again.
What was it?
Spyware.
I ran Spybot S&D's registry program, and voila! Fixed.
I installed a bunch of protection software onto his PC, and no problems since.
I don't know why people don't do this.
It's like leaving your front door wide open for anyone to walk in and do whatever the hell they want. You come home one day to find that your toaster is broken or missing, and instead of fixing the problem and replacing it, you knock down your house and build an exact replica with a new toaster. Meanwhile, you've left the front door open again.
