Hi Scot
As Chris has already said, you are using a 32-bit OCX with a 64-bit application. Anything you are trying to integrate to must now be 64-bit too.
This is a classic 32/64 bit problem, the change to 64-bit has to be thought through completely and you must be sure that you can get 64-bit versions of all the software you use.
Given that this application has a limited lifespan why are you trying to compile in 64-bit at all? I personally would leave it as a 32-bit application which will run happily on a 64-bit operating system with all the old 32-bit accessories you used before.
Got to ask yourself why bother?
Regards
David