Do what I do. I keep all of my important files, movies, and music on a separate partition [two separate partitions, actually] and I have one designated for Windows. That way, incase I need to browse the occasional crack site and get virtually raped by spyware of all shape and sizes... rather than going through the headache of various spysweeping programs I just format the windows partition. I have all of the program .exe's on my other partition so after I reinstall windows I get it back to where it used to be. Perfect.
I also bought a 50 pk. of DVD+R's for like $15 and basically backed up everything I have on my computer. So I'm pretty much invincible.
Jam it back in, in the dark.