WinMute is an Open Source utility for auto-muting your PC's volume when running the lock screen or screensaver.
It is designed to be a simple solution that allows you to mute sounds from your PC when specific criteria are met. WinMute ensures that whenever you lock your screen or your screensaver starts, WinMute will automatically mute your machine's volume. It will also unmute it when you unlock or disengage the screensaver.
WinMute is simple to configure and set up for any skill level of user. And if you need to disable it temporarily, you can by right-clicking on the taskbar notification icon and uncheck the Mute on Workstationlock / Mute on Screensaver start menu items.