"winguard" is a free program that lets you lock some features of your system so that nobody can use them while you are away.The program lets you specify a password and then choose from a variety of options - what features to lock, for example, the find tool, backing up, desktop, etc.

User Comments:
"pretty cool app!

thanks for sharing.Find the options to Lock individual items like downloads or IE extremely helpful for a non-techie like myself." - Lesley Brian