The audio driver may be corrupted or deleted. try re-installing the audio driver again.
You can download the motherboarddrivers from Intel WEB site. Select your model motherboard/device, and makesure you select the Windows XP or Vista version of the drivers that matchesyour Windows operating system.
Please click on this link andselect your model motherboard : -
http://downloadcenter.intel.com/default.aspx?iid=gg_support-au+home_downloadctr
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