I currently have Vista Home Primium 32 installed on a laptop. I want to take advantage of the MS student discount but they only offer Windows 7 Professional. There is no upgrade path other than a clean install for Vista Home Primium to Win 7 Pro. If I do an upgrade to Windows 7 Home Primium 32 can I use my Pro license key? Or can I do the upgrade to Win 7 Home Primium but do not activate and then immediately do another upgrade to my licensed Windows 7 Professional?