Uh, how's never? I built this computer in December 2005 and I'm still on the original Windows install, and it's still blazing fast. What the hell do you guys do to your computers that would make them need a format every month? The only two times I ever formatted my older computer (Athlon XP) was when 1. I replaced my motherboard and 2. Windows botched up like half the files it needs to start up, I'm 99% sure it was caused by someone else being on my computer.