Well, the H9 just uses the standard Windows USB Audio Device driver. Windows should just recognize it as a MIDI device and use this driver for it. If you haven't tried so already, you should try connecting it to a different USB port. Windows will rescan it if you plug it into a different port. If you try this and it still isn't recognized correctly, I'll have to talk to one of my colleagues about the problem who's been more on the front lines so to speak of Windows device connectivity problems.
