Use the following steps to protect your files by using a screen saver password.
Click Start >
Control Panel.
In the Control Panel dialog, click Appearance
and Themes.
NOTE: If your system is configured for the Classic View you can skip
this step.
Click or double-click Display.
In the Display Properties dialog, click the Screen Saver tab.
In the Screen saver field, select a Screen
Saver, as needed.
In the Wait field, enter the amount of Minutes
you want the system to wait before displaying the screen saver.
Check the On
resume, password protect option. Selecting this option will lock
your computer when the screen saver is activated. When you begin working
again you will be prompted to enter your password to unlock your computer.
Your screen saver password is the same as your log on password. If you
do not use a password to log on to your computer, you cannot set a screen
saver password.
NOTE: If Fast User Switching is turned on, select the On
resume, display Welcome screen option. Fast User Switching is only
available for stand-alone computers and users in a work group. It is not
available if your computer is part of a network domain.