Microsoft WINMM WDM Audio Compatibility Driver problem

I have lost all sound (except beeping). In the

System Properties > Hardware Tab > Device Manager > Sound, video and game controllers > Microsoft WINMM WDM Audio Compatibility Driver

has a yellow !.

Rigthclicked it > Properties... > Microsoft WINMM WDM Audio Compatibility Driver Properties > General Tab > Device Status says

A driver (service) to this device has been disabled. An alternate driver may be providing functionailty (Code 32)

Clicked Troubleshoot : It suggests "Uninstall and then reinstall your device."

I am a little afraid to uninstall and the reinstall the device. It talks about using the Add Hardware Wizard. But is this driver a hardware? Has anyone done it? Thanks, Eustace