I had windows vista home premium installed on my computer, I then bought a windows 7 home premium upgrade disk, and performed a clean install.I'm wondering incase I ever have reload windows 7 or perform a clean install, can I do this without any activation issues? I was told by someone that I would have activate by phone is this true?If this is true, can i activate another way other than phone?Also would I have to reinstall windows vista before, I reinstall windows 7?