Your motherboard manufacturer should have drivers available for download for the built-in sound. If you don't know who the manufacturer is, you could try this page:

http://www.amptron.com/html/drivers.html#sound

This page has drivers for Amptron motherboards with on-board sound.

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Steve Taylor - Service Manager
Altoplanos Information Systems, Inc.
Coeur d'Alene, Idaho USA
www.altoplanos.net