I have had this problem before, but I just upgraded to Windows Vista Ultimate and it happened again. I was running Windows Xp Media Center Edition 2005 before the upgrade and it worked fine. The card is Windows Vista Compatible and I have the drivers installed, but when I open Media Center it will not recognize my tv tuner. I can watch tv on the tv expert program, but not Media Center. Last time this happened on Xp I reinstalled windows and it worked fine. Vista took a little more time to install and I am hoping there is an alternative. Any ideas? I can't even find an official website to try and download more recent drivers so I'm out ideas myself.