This can be a really interesting experiment for the geek in you - or, if you're rushed for time it can be a real pain.
You've got a lot of different options here.
You can try this to do a full install off of an upgrade key: http://www.bleepingcomputer.com/forums/t/79852/how-to-perform-a-clean-vista-install-using-a-vista-upgrade-product-key/
The next option being an attempt to repair a Vista installation that's been switched to a new set of hardware. In general I'd suspect that you can delete most of the hardware in Device Manager, then shut down and DO NOT restart!
Then perform a repair install according to these directions on the FIRST BOOT in the new system: http://vistasupport.mvps.org/repair_a_vist...e_vista_dvd.htm
I haven't tried this, and it's just a variation on the XP repair installation. But, from what I've seen, Vista is more flexible in detecting and implementing hardware changes so I'd suspect it to work OK
You can try the Complete PC Restore from withing Windows (if it gets that far), or from Startup Repair (if it doesn't get that far).
Of all of them, I'd try the first suggestion because it gets you away from the problems associated with an upgrade installation (carrying hidden problems over from the old install to the new install).
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