The problem is not that there isn't an audio device installed the problem is that there isn't one enabled. Go down to your taskbar notification areas(the place with the clock) and right click the speaker, then click playback devices, right click the box under where it says
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select a playback device to modify it's settings.
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then click show disabled devices. After that right click on the speakers that showed up and click enable. Now your sound should be on.