When you say you keep getting "driver not found" messages, you mean Windows is popping up a little dialog when you connect the H9 to the computer that says something along the lines of unknown device and then driver not found?  The H9 is a generic USB Midi device and doesn't need a special driver.  We have had problems with Windows 7 not recognizing some of the Factor pedals either, and it sounds like that's what is happening here.  Unfortunately, I can't remember offhand what one can do about this problem.  If no one responds in the mean time, I might have to get back to you on Monday about this problem after talking to some people at Eventide about it.