How many of you out their have had someone snoop around your computer while you were away? Well, even if this hasn't happened to you, you can't prevent this from happening without downloading or installing anything. In this instructable, I will show you how to securely lock your computer to prevent intrusions.
Step 1: Illusion Setup
Basically, to lock your computer, we will present any user who tries to access the computer with an illusion. We will make it look like the computer is fine, but nothing will be click-able. To do this, we must first take a snapshot of the screen.
Exit all open windows, and press the Print Screen (PrtSc) button on your keyboard. Now open up paint and press Ctrl+V on an empty canvas. Your screen shot will now pop-up! Save it to anywhere you like with any name.
Next, set the wallpaper to the picture file you just saved. You are now half-way there! Wasn't that easy?