this is why i have backups after i install :)

i have the usual cds/dvds to do all from scratch, which i do when new comp or OS. But after first time clean install of things, I back up a copy to a partition on my harddrive, as well as a copy of just the installed OS/Drivers (fits 1 DVD-DL) to dvd. Worst case is i pop in a DVD and go afk 30 minutes, which i've found no need to do in the past 5 years yet :)