Another sound problem ...

I just installed 7 (x64) on a friends PC. it's working fine except his sound isn't working.
He uses the onboard sound of an Asus M2N-MX board, which should be a Realtek ALC662 card.
the odd thing is that windows lists a properly installed "hd audio device" in the device manager, but when he goes to control panel -> sound and hardware -> sound there is only one SPDIF audio-device listed there. he has his sound system connected via normal 3.5mm jacks to his soundcard, so nothing digital and certainly no SPDIF.

I already tried to install those drivers in vista compatibility mode:
ASUSTeK Computer Inc.-Support-
but it didn't do the trick. like I said, it seems the drivers themselve work fine and I guess if we had something to connect to the SPDIF out it would work, but we don't so I can't test it :D the only problem is that the normal speaker out of the soundcard isn't even listed by windows.

ideas? thanks

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