Steve, I thought you might come to the rescue like you have done so many times before. However, I tried what you suggested and Benchmark 1.0 icon is not shown in the dialog box that opens upon selecting "playback devices".
I will give a little extra info. I first disabled my Benchmark 1.0 to watch a TV show. after disableing it there was then an icon of a speaker at the top of the volume bar that appears with you click on the speaker icon located on the bottom right hand of the computer screan. I took that speaker icon to indicate the window default setting and i was able to get audio out of my TV to watch my show. When the show was done, I repeated the process and disabled the speaker icon thinking this would toggle me back to my Benchmark 1.0 icon. Instead, a third icon appeared that reads "Realtek Digital Output (Realtek High Definition Audio)" when you mouse over it.
When I right click and select "playback devices", there are two things shown in the dialog box: Speakers (Realtek High Definition Audio Not plugged in) with a greyed out icon of a speaker next to it that has a red downward pointing arrow supperimposed on it; Below that is: Realtek Digital Output (Realtek High Definition Audio Default Device) this has an icon next to it with a grean check mark supperimposed on it. There is no longer the Benchmark 1.0 icon that use to be my default playback setting.
I unpluged the benchmark from the computer and repluged it in - nothing. I went to control panels to sound options but couldn't find anything useful. I think I found the driver and it is still installed on my computer. I would just assume uninstall everything and then reinstall it like the first time i plugged it in but I'm not sure how to uninstall it and am not sure if it is a good idea even if I did.
Continue to need help, Thanks, gArth