I use Forte 3.5.1 Development System on Win 7 64 Bit.
Problem of setup you may avoid if you install it on 32 Bit System; copying it on Win 7 System and setting the environment Variables.
With srvcinst.exe you are able to install the Environment Manager and Repository Server if necessary.
With Control Panel Application you are able to modify/create the necessary registry entries.
The "Links" you may copy from 32 Bit System and modify the Path Settings in Properties.
Using Oracle DB 11.2.x 64 Bit you have to COPY the 32 Bit instant client (DLL's) in %FORTE_ROOT%\install\bin without setting Path Variable.
The main thing you should know, is that Forté using NOT the "system32 hell". All it needs for running is in %FORTE_ROOT% and it's subdirectories.
Hope that helps.