Secure your computer
If you want to protect data on your computer, you should secure individual files and folders and take steps to secure the physical computer itself. If the computer contains sensitive information, keep it in a safe location.
Other ways to secure your computer include locking it whenever you are away from your desk and setting up a password-protected screen saver. By pressing CTRL+ALT+DEL and clicking Lock Computer, you can prevent unauthorized users from gaining access to your computer. Only you and members of the Administrators group on your computer can unlock it. (You unlock it by pressing CTRL+ALT+DEL, typing your password, and then clicking OK.) You can also set up a screen saver so that whenever the computer is idle for more than a specified length of time, the screen saver starts and the computer automatically locks.