The support page for your motherboard on Biostar's website has all of the needed drivers, along with instructions for installation and a troubleshooting guide.
If this doesn't help, you may want to try uninstalling and reinstalling the driver from your device manager console.
Hi, you can download the sound driver for your Biostar motherboard here:
http://www.biostar-usa.com/mbdownloads.asp?model=P4M80-M4
Just look under "Audio" and click the right one for your operating system.
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