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:
Thanks to Dazey for this tip on the forum.