I don't want to make this a long story--I am famous for that in other boards. Is there any way to install an Upgrade of XP as a clean install without a qualifying product? I have registered 95,98,NT4.0 XP and Vista over the years. All the disks are gone except for XP and Vista--I don't want to install Vista unless there is just no other option. I don't want to have to buy another disk just for verification.