Is it possible to do a clean install on a new machine of Windows Vista Ultimate 64-bit, or do you have to have XP installed to be able to do that? I am expecting my free copy of Windows Vista Ultimate from the Windows Feedback Program in 3-5 weeks, but want to start a build this weekend. Was hoping I could install the demo version while waiting for the free copy to arrive, then just input a Product Key, instead of installing XP this weekend, then reformatting to Vista in 3-5 weeks when my free copy arrives. Thanks for your responses!