As soon as you remove the USB drive, the keyboard and mouse will stop working and when and the screen will turn dark. And when you again plug the USB back to its place, the computer will revert back normal. Also, make sure that you will remember your password when the software was used to create the key file. This is highly important. If you usually lose passwords (like i do sometimes go in the software Preferences under Main Options and uncheck the Always Required. It will show a screen like in the movies with Access Denied. How to disable the software? Its pretty easy, just right click on the notification icon the software has in the right side of the screen (yeap, same notification area) and select Pause Monitoring. If you frequently leave your desk then you must have one of these apps, so that while leaving your desk you can instantly lock your computer by plugging out the USB and again instantly unlock your computer by plugging in the USB drive. Predator setup phase 1. Download Predator and install it on your computer. 2. Insert your USB stick and format the flash drive. 3. Go to Preferences window in the Predator and set it up. I have included a picture to consult for further references. A login screen will appear asking for your password. Just enter the password used when you have created the key. If the password is correct, you will get in. What happend when the password is wrong? We have already see how we can use the built-in. SysKey Utility in Windows 8 / 7, to lock the computer using a USB stick. Today we will list a few free software that will allow you to to password protect, lock, unlock Windows PC. How To Use UltraISO Software To Create Bootable USB Flash Drive. Lock your PC using a usb flash drive02:49. In this way, the protection is still in place but without asking for password when the USB flash is inserted. The USB itself will work as a password to log you in. Now you have a movie style authentication for your computer). Go and drink a cup of tea or coffee, nobody can access your computer anymore. When youre back from your little trip, just insert the flash drive in the USB and wait for a while.