=> Use
Produkey to retrieve your current product activation keys for Windows OS, Office, etc (you'll need them)
=> Use
DriverMax to export all your current drivers to removable media (so you don't have to search for all your drivers from scratch after install)
=> Make sure you recover any other product keys for other things you paid for as you'll need to re-enter those keys again after reinstall
=> Look through
Add/Remove Programs to note programs you need to reinstall. Check if they're available for download online or you still have their download CDs
=> Backup all your personal files/folders
=> When you reformat your drive, do a FULL format not a quick format