Hi Tom, I installed the NVIDIA DVD Decoder today (I use it on my MCE box for DVD playback in MCE) and wanted to use it on my second machine - just XP Pro SP2 and the NVIDIA decoder. When I pick Play DVD from within GameEx, the screen goes black for a few seconds then returns to the menu without playing the DVD. I chose the NVIDIA Decoder in the setup. I also installed PowerDVD, and GameEx can playback DVDs using that decoder just fine. I'm not sure if anyone else has tried this? Thanks!