SystemLock allows you to disable your computer while you are away.

SystemLock disables the Alt-Ctrl-Del, Ctrl-Esc, and Alt-Tab key combinations, as well as the Windows key and the taskbar, and limits the mouse to its main interface.

It also includes a built-in screen saver, password protection, the ability to control all other screen savers, and the ability to hide your desktop icons.

The program runs as a convenient icon in the System Tray area of the Windows taskbar.