Serial Key For Xbalde Game Can I Use The Serial Key Of Previous Vista To Install A Win 7 Upgrade On A Mac ? Or Do I Buy New ?

Can i use the serial key of previous vista to install a win 7 upgrade on a mac ? Or do i buy new ? - serial key for xbalde game

I currently have Windows Vista installed on my laptop, and a look into my iMac. As for running Windows using Boot Camp. I have the new Windows 7, but I can buy the Upgrade disc? Or you need a new copy? For an update disc, the sequence number is the same as I?