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I think it may install. But I don't think Microsoft will support it on home version of vista or xp. They have it targeted towards professionals who will be using it to test there Operating system's for later use. (Professional in their mind buy the more expensive os) Its one of the ways they nudge you to buy upgrades.
[edited by: Ocean10000 at 2:57 am (utc) on Jan. 5, 2009]