I had a 4850 in my computer (vista 64) and it had to go back because it went bad. I have my old 1950 pro in right now and I can't get the drivers for it to install. I uninstalled the old ones. But when i install the correct ones for it from the ati website, nothing happens. It just installs the "ati installation manager" and then quits. I don't think it is detecting the card. Any advice?