You can do it everytime by yourself. There is a sound icon on the right bottom of your desktop (if not, then go to control panel > sounds, click the box for display sound icon on desktop). double click on it.
There is a microphone volume bar is over there(if not, select file > properties, there you will find your microphone, just tick on it and click ok). You can set the mic volume from there and you can mute your mic as well.
If I were you, I will never install any other program for this thing because every process affects the speed the computer.