Hi all, I have a computer that came with Vista Home Basic pre-installed. The Product Key is on the side of the computer. When I purchased it, I immediately switched back to my Windows XP Pro -- but I now want to go back to my Home Basic, but unfortunately, the key is already activated. What number do I need to ring in order to get it re-activated? And, how much extra would it be for me to get an Home Premium key? Or would I have to pay full price? Regards, Jason