You failed to mention your system OS version, you could try VoodooHDA:
http://code.google.com/p/voodoohda/d...g.zip&can=2&q=
It should support AC97 audio.

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My Specs
System: Custom Built
Mobo: ASRock Z68 Extreme4 Gen3
OS:Mac OS X MountainLion 10.8.2 & Windows 7 Ultimate x64
CPU: Intel Core i7 2600k @ 4.2GHz
Memory: 16GB DDR3 XMS3 1600MHz
Graphics Card: AMD Radeon HD 6870 1GB

Email/Gtalk:
[email protected]