Lock your PC with a USB Flash Drive Ever wanted to be like James Bond and be secretive? So you can prevent access to your computer, but with just a password, you are missing out on an alternate (and more secure) way to lock down your computer. Predator, a free Windows program, turns your USB drive into a key that locks your computer when it's removed. To unlock your computer, you'll have to plug the USB drive back in. (Talk about having secret-agent- style security.) Anyone who attempts to access your computer without the USB flash drive will be hit with an epic "Access Denied" message. To get started, follow this guide: Step 1: Download and install Predator. Step 2: Once Predator launches, plug in your USB flash drive. None of the contents of the drive will be deleted or altered in any way, so feel free to use your primary thumbdrive. When you insert the drive, a dialog box will appear asking you to create a password. Click OK to con...