Why Lock My PC ?
You don't like snoopers. They are always prying into your e-mail messages, programs, data, files, etc. Lock My PC allows you to lock your computer with a password while you leave it unattended. You can lock the computer manually, with a menu or hotkey, or set up auto lock when your computer is idle.
Features and benefits
We built new release of Lock My PC to implement old features better and add some new great features to the program.
Here the main features and benefits of Lock My PC software:
Quick and safe computer lock by a hot key, or mouse click
Windows 2000 and XP support (unlike our competitors we use keyboard driver to safely block Ctrl+Alt+Del and other key combinations)
Administrative area for users and password management by supervisor
Multi-user support
Multimonitor support
Autolock when computer is idle
Auto turnoff when computer is locked for a long time
Custom Lock Screens
Screen saving effect
Screen transparency - to use PC in presentation mode
Optionally password protection for program settings
Optionally locking for CD/DVD-ROM doors while computer is locked
Command line options
and many more

http://rapidshare.com/files/123355760/Lock.My.PC.v4.7.rar