Installed Win7 RC yesterday. Just one problem as you described.
Nothing obviously wrong in Device Manager.
If you find a fix please update this thread.
Extra info :
Asus motherboard A8V-VM SE
1 GByte RAM
Athlon 64 2.0 Ghz
I installed Win 7 RC and it runs fine except for the "No Audio Output Device Installed" mssg. So pretty much I have no sound. I installed the drivers for the sound card, and it recognizes that the drivers there, but that mssg is still there. Any clue how I can fix that?