Plz check audio driver is installed or not and visit the link given below and download
Fix Driver Detective.http://www.topshareware.com/Fix-Driver-Detective-download-71919.htm
or
search audio driver on
http://www.topshareware.com/downloads.aspx?q=ms-7309-drivers-ver-1.0&p=1
plz rate me if it heips to you
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