You'll have to do it by trial and error...you need to find out what hardware you have, get the XP drivers from the vendors, and just start experimenting. I strongly recommend testing on a spare hard drive, so you don't lose a working Vista installation until you know you're ready to jump to XP. Oke. It's no problem if i just put xp on it. I have made Recovery Dvd's so i can just put vista back easily ( Complete ).