you'll need to download xp sata drivers from your pc's manufacturer and put them on a floppy. then you can install xp.
I just purchased a new computer with Vista on it and I do not like the program. I know that you can have two operating systems on one computer and make one the dominent one when you log on but I cannot get it to recognize xp when I installed it. But I cannot figure out how to delete the partition with vista on it. If anyone knows how I can get it off of my computer it would help me ALOT!