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For anyone unfamiliar with this, you can set up Windows 8 to store the key used to decrypt encrypted passwords on a USB flash drive. This requires anyone trying to log on to both know the password and have the flash drive with the encryption key. Without the drive, no one can sign in to your PC. If you do this, make sure to have a backup of the flash drive, because if you lose it, you are not going to be able to use your PC.
Here is a link to a guide on how to set it up. It should only take you a few minutes. http://www.sevenforums.com/tutorials/243846-syskey-create-usb-key-lock-unlock-windows.html