In case anyone is actually looking at this forum here is some added information. I found some info indicating that I needed to add a driver to my system which would allow the USB to communicate with my originally serial port equipped unit. I have installed that software and the computer now says that something is connected to the USB but it doesn't recognize what it is. The device manager shows it as an unknown device and I can't seem to do anything to get windows to recognize it. This unit isn't really that old, only about five years and Windows should definately be recognizing it. Any and all assistance that anyone could give would be appreciated.