Every time new programs are installed, I lose my windows sound

I bought a computer a few months ago, I noticed each time that the computer is an upgrade or install a program for my daughter, the sound system goes.
so when I do a recovery all come back normal. which need to be fix, I don't need to do more.
original title: why my computer doesn't have a sound everytime I isntall a program

Using Windows 7?

If so, after that the problem begins, try to use the audio troubleshooting to see if he can identify the problem: http://windows.microsoft.com/en-US/windows7/Open-the-Playing-Audio-troubleshooter

See also: http://windows.microsoft.com/en-US/windows/help/no-sound-in-windows

Tags: Windows

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