After instalation of windows 7 - says "no audio output device instaled

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I upgraded system from xp to windows 7 proffesional . After this no audio files are played back

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This will be because you havent installed your device drivers.

if you do a start search for Device Manager and open it up you may see a lot of things with a yellow triange with an exclamation mark in it. This means the software drivers are not installed.

Firstly, try running Windows Updates.

Failing that you will need to either:-

- If the PC is branded you will have to go to the manufacturer website, enter your model and get the drivers.

- If the PC is custom build you will need to get the make/model of the MOTHERBOARD (you can use speccy to get you that). Go to the manufacturer website and get drivers.