Child Lock is a handy, easy to use tool specially designed to help you lock the keyboard and mouse so that they aren't available for kids.
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.