This has been discussed many times, and of course it's not a problem of the product, nor obviously a problem of running under Windows 7 x64, we ALL run Window 7 x64, I'm not even sure if our products still work on XP, because we don't test with it anymore...
It's an FSX bug that sometimes happens randomly with every module from any publisher, especially after the first time it runs.
Check all the following:
- You don't have any "compatibility mode" for FSX.EXE enabled. Right-click on FSX.EXE, select "Properties", select "Compatibility" and be sure nothing is checked on that page, which is how FSX defaults to.
- Try a Windows reboot. Launch FSX again, ALLOW the module to run, even if FSX says it might cause problems, and even if FSX crashes. Try a couple of times, and if it doesn't work, reboot Windows again and try again.