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At some point in the past I tried out a serial monitor program from HHD Software. Somehow it left it's port monitor driver (hhdspmc64.sys) installed on my system. I'm trying to track down problems, and I want this thing gone so I can prove it's not the source of my other problems.

I've proven it's a class filter using the devcon command (from the Windows DDK): devcon classfilter Ports upper, which lists hhdspmc64 as the only upper class filter on that class.

How do I get rid of this thing?

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It took me a few tries, but I finally found the appropriate invocation of devcon to do the job:

devcon classfilter Ports upper !hhdspmc64

A variety of examples of devcon usage are found at the examples page, and reading devcon help classfilter is mandatory for understanding the removal syntax.

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