I have just upgraded four machines with new Motherboards, CPU and Memory.
Two of the systems use an Asus A7N8X-X (nForce2 400 - nForce Audio Codec) and the other two use an Asus P4S8X-X (SIS648 - SoundMax Digital Audio System).

I am experiencing the same problem as people on this thread:

http://forums.windrivers.com/showthread.php?t=56720

but I am using Windows 98SE.

In device manager the driver is installed and working OK but in Multimedia Properties under Control Panel there are 'No Playback Devices' available (the selection is greyed out).

I have not wiped the hard drives as this will take too long.

I have also tried the latest drivers from Asus.

Any idea how to fix this?