Automuter is a simple application that lets you automatically mute your PC`s speakers for a specified amount of time (for example, during the night, or while you rest for a bit). You can also indicate that it works while the screensaver is on, or when the PC is blocked.
Another option of Automuter is the designation of a key to stop the sound at any time you want. This tool will result in being very useful when you have your PC on 24 hours a day, but don`t want it making noises for the whole time with alarms, warnings etc.