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MINIMUM SYSTEM REQUIREMENTS:    - PC with 1.5 GHz equivalent or higher processor    - 256 MB of system RAM    - 64 MB DirectX 9 compatible video card    - 500 Mb of free space on the MS FS hard drive    - Microsoft® Windows® XP SP2 or Vista    - Microsoft® Flight Simulator X SP2 or Flight Simulator X Acceleration.    - Internet access (for installation/ re-installation) Please note, we are unable to support technical issues appeared on systems that do not conform to the minimum system requirements.

A simple question. Have you installed SP2 for FSX, or Acceleration (with SP2)? If not, install whichever one of those you have.

Two things that are worth trying:

1) Reinstall SP1 and SP2 (or Acceleration) for FSX.
See if the 767 is working after you have done that. If it isn't...

2) Repair FSX by putting the DVD in the drive and let it continue as if you were going to install FSX. When given the option to Repair or Remove FSX, select Repair. After you have done repaired FSX, reinstall SP1 and SP2 (or Acceleration).
Again, see if the 767 is working after you have done that.

Mark