A screen saver is a moving picture or pattern on the screen, originally designed to protect computer monitors from damage from stationary images or text over a long period of time. It activates at a set time after your computer becomes idle. In Windows Vista, the default setting is usually five minutes, but the screen-saver timeout can easily be changed to suit your preferences.
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Right-click on your desktop and select "Personalize" from the menu that appears.
Click on "Screen Saver" in the Personalization menu.
Use the up and down arrow keys beside the "Wait" box to select the number of minutes you want the computer to wait before it activates the screensaver. You can also type the number of minutes directly into the box.
Click "OK" to finalize your settings.