Hi Brian and Michael, I've come to the conclusion that this is an AN glitch. Because we were getting so many problems, I completely re-formatted the HDDs, loaded Vista from scratch, went on-line, and downloaded all the Updates (incl. Service Packs 1 and 2) - five days later! Loaded ANRB 3.07 software into a new folder C:\AirNav Systems RB, when I plugged in the RB and was asked for Drivers, had to open the folder and then Driver sub-folder and away it went, but despite advice from Brian, Gary and others, still can't get 3.08 to run.