1. Back up for files to an external harddrive. Purcahse external and copy/paste.1a. You can also back up for files to online drives (Xdrive, mozy), but it'll take forever to d/l them again.1b. Burn files to a CD2. You may want to image your drive before you install windows. This will allow you to keep personal settings and programs. I think. I'm not too good with it, since I've never dealt with that (whoohoo CCleaner). Anyways, do a search for image harddrive