Great news, I've got Vista build 5728 running on my old 700Mhz Athlon with only 384 meg ram and an old GeforceMX 440 8X vid card,(dual boot with XP Pro) I also have Office 2007 beta installed and Symantec AV v10 running. Booting takes slightly longer the XP and my "Vista Experiance Rating" is @ 1.0 due to the old Gforce card.