The short answer to your question is No! You cannot run Vista and XP (or any other OS) from the same partition. Here is a pretty good article explaining the process of Vista and XP dual boot systems. Hope it helps you.
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I purchased a new computer which came with vista. It already started getting into my nerves. Most of the security programs do not work despite the updates (ZoneAlarm, System Mechanic...). My question is : can I install XP on the same partition as vista? Or do I have to wipe out the HD, install XP and then Vista?
My best regards.
I still have another option. I have XP installed on an EDI HD in a external USB enclosure which I can boot from USB.