My volume control will not open simply because it says 'there is no active mixer devices available' then it tells me that I need to install the mixer device.....
It turns out the problem for this error lies in the Windows Audio Service, which usually starts automatically when the sound card is installed and working. However, in this case the service was turned off.
Follow the instructions below to reactivate the Windows Audio service:
Click on Start and Run
Type the following command and press Enter
Scroll down to Windows Audio in the right-hand column and double-click on it
Make sure the Startup Type is set to Automatic and click on the Start button under Service Status.
The Windows Audio service should restart and the error with the volume control should be resolved.