Just in case you havent sorted it out yet. I replaced a USrobotics dongle with a Zoom 3905 that wouldnt work when I followed the Zoomtel instructions got the same message as you. It worked well when I threw their istallation disc away and ignored their webinstructions. Removed all attempts to instal in the net work and just stuck it in a USB port and installed as a printer. Works like a charm dont forget the default is dont receive so have to turn that on.