I purchassed the P.M.D.G 737NGX four weeks ago and have not been able to load it on to my computer. I also have the 747and the 757 on my computer also they loaded with on problem. When I load the setup it goes right throught the complete program right up to the directx loading than it completes without asking for the registration key, I restart the computer go to flight simutator start with a differance aircraft at the gate than load the 737ngx and its there, I set it up for flight with no problem but just after take of fparts of the aircraft start to become transparent than I lose a wing or the tail. I dump the program using the same disk to uninstall run the setup again same thing it install's fully with out asking for the reg-key I reboot the computer go to flightsim there it is again until I try to fly it, How does the aircraft load without the reg-key