UPDATED ON: December 4, 2013
Child Lock is a free software that locks keyboard and mouse of your computer to avoid little children using them.
Can be set to autolock after a period of inactivity - stops little fingers once you have left the PC.
Can block out windows control keys - switch out of the current application (provided the app is running fullscreen such as a game)
Can slow down the mouse, stop autorepeat - assists young ones just getting used to a mouse and keyboard.