Have you installed the drivers for your Audio device from the disk that came with your mobo or the audio card?

If so you will need to get updated drivers for the manufactures website.

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Rig Specs: Custom Built:
ASUS M2N4-SLI
AMD Athlon 64 X2 Dual 4600+
512MB SLI NVIDIA GeForce 7950GT OC
2.00 GB Elixiur RAM
400GB Hitachi SATA II HDD
Western Digital 120GB IDE HDD
Samsung SyncMaster 932B Monitor
More to follow soon.....