Dell Inspiron 2000 Manual page 19

Choose a screen saver from the Screen Saver pull-down menu, or click (None) if you prefer not to activate a screen saver.
NOTE: External monitors may also have fields for other display controls, such as energy-saving features. For more information, refer to the
documentation that came with your monitor.
When you select a screen saver, you can click Settings to change the various features of the screen saver. Click Preview to run the currently selected screen saver.
After you make any changes, click OK to accept them and close the Display Properties window.
Desktop Themes
You can change the way your desktop looks and add sound effects by using desktop themes. To change desktop themes, follow these steps:
Click the Start button, point to Settings, and click Control Panel.
Double-click the Desktop Themes icon.
The Desktop Themes window opens.
Select a theme from the Theme pull-down menu and click OK.