did you Download the Hot fix from Here as this is known issue i think your problem will be solve just try downloading this hot fix from microsoft.
http://support.microsoft.com/hotfix/...111&kbln=en-us
Version 1.0a of the Universal Audio Architecture (UAA) High Definition Audio class driver for Microsoft Windows has been released. This release supports the High Definition Audio and Modem implementations that are known to Microsoft as of August 1, 2004. This is the second version of this driver.
Version 1.0a of the UAA High Definition Audio class driver does not work on High Definition Audio implementations that were disclosed to Microsoft after August 1, 2004.
You must uninstall version 1.0 of the UAA High Definition Audio class driver before you install version 1.0a. For more information about version 1.0 of the UAA High Definition Audio class driver
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