I've been wanting to do this for a while. Sometimes my computer just starts acting wonky, and I know a format and full windows reinstall is forthcoming. about the only thing I really need on it is my music and some pictures (if you call random internet lolcat pictures I downloaded stuff I "need"). But anywho, today I got home from work, and I'd start up my computer, and it would get all the way to the windows desktop, then reboot. It repeated this in an endless loop.
Luckily, I always keep an external hard drive with all my drivers, FLACs, and pictures on it. I also keep my Windows CDs in a safe place. Just a friendly reminder to always be prepared!
computer is running super smooth now. need to reinstall wow, eac, and foobar. such a pain in the arse setting up eac and foobar again, ack.