Jim, thanks for the input-I appreciate it!.I've ran the registry repair program but didn't seem to change.You're assumptions are correct-I I've the program onto the c: drive.I think FSX is running ok because the normal 737-800 looks to me.In the 737 NGX the instruments seem compressed and distorted and it eventually crashes anyway.I'm running i core 5 with a ge-force 405 graphics card-I thought that would have been enough?-I will remove 737-NGX and try again-only thing is I'll need another code from PDMG to reinstall which is a pain.I think that program is more trouble than its worth to be honest.