Realtek high defintion audio device sound card problem, 10 points+best answer !?

IT SAYS THAT THE DEVICE IS WORKING FINE AND WHEN I DO THE TEST THE SOUND COMES OUT THE SPEAKERS BUT WHEN I PLAY MEDIA AKA CDS, INTERNET, WMP THERES NO SOUND BUT NOTHINGS MUTED AND ACCORDING TO THE COMPUTER THE SOUND DEVICE AND SPEAKERS ARE WORKING FINE BUT THERES NO SOUND, ???