Ok. I made a copy of Doom 3 with Alcohol 120%, and it installs and plays on my Pioneer a07XLA. I tried to get it to play on my other system with the Plextor PX-716A, and it tries for about 3 minutes, and then just disappears. I had clonecd installed on my system, and uninstalled it and cleaned up the registry entries. There are no virtual drives installed on this pc. Any other things I can check or try. It should work, shouldn't it?