I just bought this card replacing my 7600GT. My problem is that it installed some "ATI HD Audio Rear Output" on its own while installin the graphics card, and made my Realtek HD audio driver disapear. The problem with this new ati driver is that its not producing any sound. I've checked the mute buttons and still nothing. I tried changing default devices but "ATI HD Audio Rear Output" is the only option. Can someone please help me.