Counting on buying an upgrade version of Windows Vista, but wiping the machine first of the old version so it’s a clean install? Bad luck, Microsoft’s made changes that will prevent it, unless you install onto an empty partition. Never mind that it’ll make a periodic re-install a right pain in the arse. What were they thinking?
PS. Tuesday: Ed Bott pours cold water on this, not saying it’s untrue, but saying “wait and see…”