You need to install sound (and probably other) drivers. Please refer here: http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&os=W764&osl=en&SystemID=INSPIRON1564&catid=-1&impid=-1
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Go to Welcome to Dell Support and fill all the options for your Dell model, they will guide you for the driver.
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