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At the top-left of this page go to Product Support and then select "Downloads" from the drop-down menu. Enter you Service tag, choose "Audio Drivers from the download category, select your operating system and then click on "Submit". That will bring you to the page where you can download the audio drivers for your system. Before installing the new drivers make sure your existing one have been uninstalled from Control Panel>Add/Remove programs and then reboot before installing new driver.
My Drivers enables easy and fast detection, backup and restore of all hardware device drivers currently on your system. Also, you can even find the latest drivers for your hardware and install them onto your computer.