Hello everybody
this is not a new problem but a new answer to an old problem. Many times it has been addressed that NTDLL.DLL errors occur on our FSX and it is known that troubleshooting these problems is extremely difficult.
I have an OC Core i7 930 System with a Win7 and a Sapphire Toxic-OC ATI Radeon HD5850 and Onboard 3D Sound.
I have FSX Acceleration, Pilots' FSGlobal Europe&Africa, UTX Europe, UTX USA, GEX North America, GEX Europe, FEX and ActiveSky Evolution. I used to get my NTDLL.DLL error after about 45 min after take-off with ConcordeX.
First I checked my Graphics Card and Soundcard drivers for updates. Everything okay and up to date.
I found the following:
Uninstallation/Installation of FSX - error occured again
Swapping NTDLL.DLL with a different file from web - error occured again
But then:
Updating DirectX9 and MS Visual C++ - error did not occur again and I could finally fly!!
If you are encountering the same problem, this might be an idea as to how to get it fixed.