[Si|ent]

Sounds liek a fault with your DVD Drive, or your system detecting what is within it fast enough.Make sure you are choosing the 'full install' option (installs radio stations rather than reading them off the disc) and try again.

Failing that:
Install the latest drivers for your DVD drive (if any)
Purchase a new DVD drive or try an alternate one if you have access (a friend maybe). These problems largely affect cheaper "brandless" drives, so it's recommended that you buy a 'named' one.