I'm not a nerd like that anymore. I haven't reformatted since I first installed Windows 2000, probably over two years ago. Then I got XP. I thought about reformatting, but then I decided to see what happened if I just put the disc in and let it do the upgrade-install. Call me lazy, but it worked, and it's still working, so I'm just letting it go. It would be such a PITA to download everything again and re-install it all.
Well, I probably just lost everyone's respect who reads this, but what are you gonna do?