If your computer came with a motherboard disc the sound drivers could be on it
Click start control panel administrative tools computer management device manager scroll to sound video and game controllers you might see a yellow question exclamation mark? ! or a red X Right click to reinstall drivers.
http://download.cnet.com/realtek-high-definition-audio/3000-2120_4-10788600.html
windows 7 32 bit
http://download.cnet.com/realtek-high-definition-audio/3000-2120_4-75317047.html
windows 7 64 bit
hope this helps
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