In the volume tab in Control Panel/Sounds and Audio Devices window I have the win
default sound scheme set in the sounds tab. In the audio tab it shows No audio device and
the the device volume and speaker settings are greyed out.
When I manually try to play a windows sound in the Sounds tab I get an error message that
says my sound card may be in use.
Answer
Check Windows services.
Right Click My Computer and Manage.
Choose Services and Application
Services.
Choose "Windows Audio" and set to
Automatic and Start.
I had same error after automatic windows update.