The USB driver should be part of the WindowsCE OS load that the iFly runs on. Ed Moore at Adventure Pilot said the latest OS version for the iFly is 2.0.4, but I have an older unit and am currently running 2.0.0. As I mentioned in "UPDATE 2" to my first post in this thread, AP's shipping me an OS update on an SD card, and they expect that to resolve my issue. I should get it in a couple of days and will report back.