Without Audio Driver, you can't play sound,nor could you use microphone. Audio driver is usually auto installed in Windows 7, but sometimes you may installed a driver which didn't compatible with your computer, or you may interrupted the install progress so the audio driver work abnormally, or the audio may be damaged by some program.
Updates Audio Driver: Right click on the audio driver, click Update Driver Software.
In the dialog that appears there are two choices, click Search automatically for updated driver software, and the driver would automatically be updated.
If the driver automatically installed don't fits you system well, you could download the audio drive from the Internet beforehand and click Browse my computer for driver software.
You could install audio driver automatically with Windows Update, but you must be connected to the Internet.
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