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?