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29 Oct 2009  

7600.20510 x86

Here is a perfect solution for you.

Create a Shortcut or Hotkey to Mute the System Volume in Windows :: the How-To Geek

Please let me know if you like this as much as I do.

As shown in screenshot, I am using F1 key to mute and un-mute audio perfectly. I can also use mouse to click on the shortcut to activate/deactivate, same as using F1.

Attached Images
System mute in W7?-capture.jpg 
My System SpecsSystem Spec