You should find the answers you're looking for by clicking here to review some notes on the subject in the forum sticky.
Hope this helps,
I bought a new computer from DELL that already had WINDOWS VISTA on it. I like it but I don't want to study further now (maybe later). I would like to know how I could switch the computer back to use WINDOWS XP? I have tried to boost to install XP through CD but after setting up, there was always a message asking me to run CHKDSK/F and stuck there.