FATAL ERROR: Could not initialize ACIS
 

I am trying to run Gambit 2.6.4 on win7/64x . I installed exceed 2008/64x ; When I run gambit.exe, I have this error :

FATAL ERROR: Could not initialize ACIS.

and I have already reinstalled exceed and gambit several times, everytime I run gambit , this error occurs.
what's wrong with gambit/exceed or my computer. and how should i do with the error.

thanks dsqx