problems with threed32.ocx

I'm trying to use the sheridan 3d controls, but it tells me that I don't have the appropriate license to use it in the design enviornment. Here's what I've tried:
> I've tried unregistering it and registering it (regsvr32)
> I've tried unregistering, deleting, and re-installing it.
> I've tried the .reg fix that comes on the Visual Studio 6 CD.
> I've tried VB6C.EXE downloaded from microsoft.

None of this has worked. Has anyone got any home-made voodoo remedies I could try?

You aren't using Learning or Control Creation Edition are you??

nope.

Which edition do you have? To my understanding, you may only use it in the Professional and Enterprise editions.