I am no longer able to hear sound when playing DVD's (Intervideo DVD) or cd's with video ie on Wndows media player. The only sound we hear is an ordinary CD in windows cd player. We do not hear sound when starting up Windows or Chimes etc. I have tried following the advice on Help from windows but nothing seems to do the trick. I do not appear to have any drivers missing and have reloaded Windows 98 SE as well as updating windows media player. This is so infuriating so any advice would be greatfully received.