Yet again, I'm posed with another one of those problems that seems to somewhat spread from computer to computer. We have a few computers, all being the Dell Optiplex GX270 machine using the ADI 198x Audio driver. The problem is that when you turn on the computer and login as the user, you will hear the regular windows sound. After that, on some machines, Windows Sound completely disappears. When you double click on the volume icon, it states that there are No Media Device Mixers installed or available on the system (I don't have the exact error message, I have to get that). Is there a reason why it's occuring on this? I'm not certain if this is a specific hardware issue with that sound driver, or a Windows issue working with the sound. Thanks!