There is a HRD User Group that you can get to from HRD in the Help section drop down box. But first tell us how you have the radio and computer connection configured 1 are you connected to a RS-232 comport? 2 or are you using a USB to Comport converter? Some of the less expensive converters do not work very well or at all for this type of set-up. 3 have you tried a slower baud rate on the connection speed? 4 is the right comport selected? If the anwser to 1 & 4 is yes then I would goto the user group there is a bunch of great guys there that can get you up and going real fast. Here is the link to get there.
http://forums.ham-radio.ch/index.php 73
Roland AH6RR