I have a 3 week old Dell 537s running Vista 64Home Premium. I received my upgrade disk (7 Home Premium)yesterday and when I loaded the first(Upgrade Assistant) disk I received an error message saying(upgrade asst could not load bexcasue of a problem with other programs) Dell, of course, was no help and told me I had to do a total reinstall of the new O/S/. I want to avoid that, if possible. Suggestions?