Screen Lock is free and lightweight application. It does lock the screen, mouse, and keyboard for a specified time. After specific time, it automatically unlocks your system.
Full Specifications
What's new in version 1.0
General
ReleaseApril 28, 2013
Date AddedApril 29, 2013
Version1.0
Operating Systems
Operating SystemsWindows 2003, Windows 2000, Windows Vista, Windows, Windows 7, Windows XP