You should be able to find the driver on the manufacturers website: http://www.tyan.com/support_download.aspx
If not then use the following software: (it will help you id your hardware and possibly a download link to get your sound driver)
To find make and model of pc hardware, EVEREST Home Edition is a free system diagnostics, system information program that will id most hardware onboard a mb. as well as the actual motherboard.
Alternate Everest download link: (offers 2 sites to dl program from)
Run the program and then:
Click on Computer
Click on Summary
Right hand window (hardware) if the text is blue
this is a link to the web site for that particular hardware.
If you have additional questions or need further help, please post a SUMMARY report from Everest.