Right now i'm on 32 bit vista ultimate and i would like to try 64 bit. I've got a legit vista ultimate key but i've only got the 32 bit disk. From browsing the internet i have heard that all vista 64bit disks are the same ie. i could use a vista home premium disk and install ultimate. My friend has a 64bit home premium disk and i'm just wondering if i could install ultimate from it and save myself the hasle of finding a legal/clean torrent.