Dear Forum Members, IÃ‚Â´ve met the following problem in the last days.... I have a laptop, built-in 5.1 speaker....and after installing the drivers it was good for a few minutes, and then the center, and the upper right speaker stopped working.... I first thought about hardware issue, but the ACer techies told me that theres nothing wrong with the speakers.... so it must be software.... I tried the latest 2.26 realtek high definition audio driver as well....but it was not good either... I tried under Vista as well...also the same... Do you have any idea??? thanks for helping me out.