have you tested if it works in say windows media center? also please remember that you may only bump your topic if it is needed once it falls off page 2 now that can take around a week maybe 10 days sometimes.
let me know if the song and audio work in media center or even try youtube.
Just a note
the sound bars work all around on your system there is none for just the internet,but I would really think just removing your old drivers(sound and maybe video) and reinstalling the new ones would be the besy way to fix this problem if it really is as big as it sounds.