I've had the same problem - demo works, FaceTrackNoIR doesn't. (I get the same error he does)
I tried uninstalling the demo, uninstalling faceAPI non-commercial version, then reinstalling just faceAPI, and still get the same problem.
I tried running as admin, in compatibility mode, but nothing seems to work.
My system is a Gigabyte P67A-UD3, i5-2500k, 4GB ram, Win 7 64-bit.