I am trying to use the EVAL-ADFXXX USB board with the Integer-N 5.1 software. I have already tried using the parallel port up to the point of receiving an error involving parallio. I have seen in the forum that in this case it is recommended to use the USB adapter board. I have tried the adapter board with no luck. I have verified that the PID is correct. The Device Manager recognizes the device as an ADF4xxx USB Adapter Board under USB controllers. The only thing I have not tried is to install the original USB drivers, as I cannot locate the installation CD. Any help or suggestions would be greatly appreciated. Thanks.