Auto Lock

Auto Lock is a very useful tiny Little free program/app that will enable users to perform actions such as lock, log off, restart or shutdown for their desktop / laptop / tablet PCs when the device has not been used for a certain period of time.

No installation is required, it is portable, works on all windows platform including (Windows XP, Vista, 7 and 8 Developer Preview). This program also comes build in screen off and system mute function (which will Automatically Lock & turn off your screen on your demand and turn off the system sound while locking or shuting down your pc, therefore everything will be done silently), just MOVE the mouse or press Any key on your keyboard to turn on your screen instantly.