Lock your pc with usb!

Yes its true u can lock u r pc with app known as "Predator"
this app creates key in usb if u remove it then black screen comes and no one can do anything till u again connect that usb

This application protects your PC with a USB flash drive

PREDATOR Professional locks your PC when you are away, even if your Windows session is still opened.

It uses a regular USB flash drive as an access control device, and works as follows: * you insert the USB key * you run PREDATOR (autostart withWindows is possible) * you do your work... * when you're away from your PC, you simply remove the USB flash drive: once it is removed, the keyboard and mouse are disabled and the screen darkens * when you return back to your PC, you put the USB flash drive in place: keyboard and mouse are immediately released, and the display is restored.

It's easier and faster than closing your Windows session, since you do not have to retype your password when you return.
Here are some key features of "PREDATOR Professional":

? Monitoring options
? Alarm options
? Password options
? Language selection
? AutoStart with Windows
? Check for updates
? Enable pause
? View/Export local logs
? Allow multiple keys
? Send Email and SMS alerts
? Protect Preferences
? Enable splash screen
? Enable Task Manager
? Enable exit
? Disable local log
? Open log after alarm
? Twitter Log

PM me for its full version