Go back to the previous Detonator driver version. nvidia has given in to Macromedia, and the newest version disables all DVD playback if you have a non-Macromedia-approved TV chip on your card, whether you're using it or not. There is no way to disable the chip so that Windows doesn't detect it and install drivers. You might be able to disable the chip in Device Manager (not uninstall, just disable) and maybe that will make DVDs play, but I doubt it; I haven't kept up with how people may be trying to bypass this problem.