Pen drive as a key for your computer

Hi friends........
     I found simple method to protect our computers. We can't open a locked door without suitable key. You can use this method to lock your computer with your pen drive. It's very simple.
    Download this software bellow & install it usually,,,,,,,,

                                                          Download

Double click & start the program......
You can see a message box like that.

 

         Insert your pen drive & press 'OK' button..
Then open window like that,,,

                      
      Put minimum values to read interval, write interval & screen darkness for lock soon.
I think you can understand this post. if you get any problem, leave a comment. 
Good bye & luck......