I own Vista 64 Home Premium, couldn't run it as there seems to be no drivers to properly run 570 chipset(at least on my system). My hard drive was thrashing like hell and it would take 20mins just to get to Vista log in panel. I have a DX9 card and only 2GB or ram. To really use Vista I'd have to spend hundreds to properly use it..Not gonna do it anytime soon. I had a problem too, my Xfi fried and I didn't know about it. This originally attributed to all my problems. But when I yanked it and booted up it was the same thing....I could have gone with the default drivers but then I had lots of unconfigured devices... I thought, whats the point? I yanked Vista and put XP back in... As to DX10 and DX9, I just don't see the worth. For example, I play Lost Planet a DX9 and DX10 game... the DX9 to me is jaw dropping as it is..