If I buy the Windows Vista Home Premium UPGRADE (with SP1), will this work with fusion. I already have Windows XP Pro installed and working properly. So will the upgrade work? I ran the "Windows Vista Upgrade Advisory Tool" and it said my video card is not sufficient. I'd like to run Windows Aero and all of Windows Vista's features. I have a 2.2 GHz MacBook Pro with 128 MB Video RAM and 4 GB of RAM. Thanks in advance.