I've just bought Sonic Cineplayer DVD Decoder (from Sonic $14,99) and I can't get it working. I'm running the Windows Media Player v.10 and the DVD Decoder seems proporly installed. However, when I try to play a DVD I get a complete dark screen and I don't have access to the DVD menu. It says something like "unknown DVD" and I can go from one chapter to the next but the PLAY button doesn't work. Of course, I can't see or hear anything. Does anyone know what's going on?