How to fix audio driver windows 7 problems

pls how can i fix the audio/ sound problem on window 7.
Actually , it was ok window xp on Nec Generation Laptop until i upgraded OS to wins 7 and the sound stop working. when click on it, it says no audio output device is installed.
I appreciate if you treat this as urgent.

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More about audio driver windows problems
  1. google.
    make and model + "driver" + "windows 7"

    or maybe it didn't have windows 7 driver. Should have check it before installing windows 7.
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