Just installed my HD radio last night, and here are the steps that helped me succeed:
First I made sure i had .net 2.0 installed -
.net
Make sure you have the newest version of roadrunner -
installer
run "runme1st" which is located in your roadrunnerdir/HDRadio directory after you install road runner
Under RRConfig->Radio choose HD Radio and pick your Line used for Radio Audio...
under RRConfig->INI Variables add: hdradioport=X where X is the COM port your HD radio is connected to (save and exit)
And run road runner and try it out.
it should work after that. when i click on radio in my skin i hear a click coming from the tuner. that should tell you the computer is accessing it. I had a tough time getting it to work in my car computer last night. the way i solved that was a fresh clean copy of of Road Runner. (i had just updated it from a previous version). You don't need to install mitch's software program (although you can use it to test your radio out). Good luck!
james