Strange issue encountered by a customer where the audio device was not disabled, but the troubleshooter kept saying it is disabled and needs to be fixed, sound card was showing as working properly in the device manager, yet there was no sound.
The cause of the issue as reported by some is an update from Microsoft which corrupts the permissions.
All you need to do is re-assign the permissions:
1. Go to Registry Editor by Clicking Start and Typing regedit
2. Click OK
3. Registry Editor will open up, browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\
4. Right Click MMDevices and Select “Full Control” for SYSTEM, Your Username and Administrators
5. Apply the settings, Click OK
6. Then browse to Audio\Render within MMDevices and repeat step “4” for permissions.
7. Apply / OK and restart the system.