I just saw this on THG: ""I have the Business upgrade version of Vista, and my frustration with this was that on first installation there was a driver related problem which crashed the machine rendering XP and Vista un-bootable. I obviously then reformatted the drive and began again to install vista. The upgrade key will not allow a fresh install! You have to install XP again first, no simple "please enter XP license that you are upgrading from." I reloaded XP, tried again, same problem, crashed on reinstall. So I tried again with a fresh install of Vista, if you don't insert the license key then it will let you continue the install, picking the version that you own a license for. All works fine, loaded, all drivers perfect! Then came to activation, "sorry this license is for an upgrade version." End. More than a little frustrating. So the answer is clear, disable all onboard hardware, sound, network etc, remove all PCI cards, disconnect everything, load XP, upgrade to Vista." Has anyone else had this kind of problem? Will Vista be able to scan a CD of Windows XP as proof that you're upgrading? I might be going for an OEM version after all!