What I don’t understand is why they didn’t build into the install to “move” your previous XP install into the “XP mode”, that would be such an easy upgrade for the users. Oh well, if they did all the stuff with software they should we geeks wouldn’t be able to show off.
Windows 7 is intended as an upgrade to Vista; not XP. In fact you can't upgrade to Windows 7 from a Windows XP installation. I would suspect that's the overriding answer to your question.