Registering Halion 3 in Sonar 5 Producer

I’m operating in Windows 7. Halion 3 64-bit opens and runs fine in stand alone mode. However, I cannot get it to fully register in Sonar Producer 5. It has worked for me before in the past, in both Rewire and as a VST in Sonar 5.

Halion 3 is absolutely ESSENTIAL to my music production. Any suggestions out there to effect registration with Sonar 5?

Thank you!