Well first You must have the XP CD installer. Then set your computer's Bios boot sequence. Make your CD rom the first at Boot sequence. But for a proper guide just follow this site's guide. It's just simple if you have installed the vista in your computer then this will be just a piece of cake. http://www.blackviper.com/Articles/...
Since this is the Vista forum, it might help to shed some light on why you need XP. You just never know, someone might actually suggest something to you that could come in handy for the circumstances behind this XP need of yours.
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