Turning off the computer voice software

Mute on Lock
At certain times, we want the music that appears when turned off or lock the system. When you're computing in the room at night and no baby is sleeping or you're using a notebook in class, it certainly sounds very disturbing. Try using this application, Mute on Lock 1.0.
The application is working in the system tray, and monitor your activities while computing. When about to turn off or lock the system, then this application will automatically turn off your speakers. In addition, because the place is on yan system tray, will allow you to turn off the center speaker.
With less set to be made on this application, when your done double click it. It enables you to be turned on / off sound, or activate / deactivate application

Source : id.shvoong.com