I'd start by installing XP on a clean machine (back up first, of course) and then install Vista. I believe there is an option in Vista's install procedure to leave XP on the machine so you can dual-boot.
I doubt you will have any success installing XP on a Vista machine.
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-- Andrew
Just Andrew.
Do I contradict myself?
Very well then, I contradict myself.
(I am large, I contain multitudes.)
-- Walt Whitman, "Song of Myself"
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