yes, you could say FREEZE as well. I have the same like Ike: "I cannot exit the game at that point anymore, open up Task manager or anything. Only a hard system master reset works for a full reboot of the system." I can fly and out of nothing the screens turns black or sometimes pink or similar and I still can hear noises from the plane, but the sim crashes and I have to reset to restart the PC. I did changed the TdrDdiDelay and TdRDelay only in the GraphicDrivers registry. What do you mean with register keys?