That may be the question if you're considering "upgrading" to Windows Vista. There's apparently enough doubt in the success of a Vista upgrade that many retailers are allowing Vista upgrades to be returned if your upgrade failed ... but now electronista reports that it appears a Vista upgrade permanently invalidates your XP license keys. So you may not be able to go back.
What's more, you cannot do a clean install using a Vista upgrade by showing it your XP install media — a Vista upgrade will install only on top of an existing installation. So if your Vista system craps itself badly enough that you have to reinstall, you have to reinstall XP first, only your XP license keys may by now be invalid ....
Sucks to be you, don't it?
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Re: Lesson