Do you have a RoKu or Pinnacle branded SoundBridge?
Did you try to go to firefyl’s web config panel? it should be located at http://localhost:9999 on windows.
You might also be lucky at http://localhost:3689
If you can access that, then firefly is running. If you can’t, you might want to check your config file and set the music directory to the folder where your collection is located BEFORE you attempt to start firefly.