How to select or configure a screensaver- Windows 7
1. Right-click on an empty spot of the desktop (not over an icon).
On the pop-up menu, select "Personalize"
2- At the "Personalization" screen, click on "Screen saver"
2. You will finally arrive at the screensaver settings dialog.
3. From the "Screen saver" drop-down list, you can select one of the pre-installed
Windows 7 screensavers.
4. To configure the selected screensaver, click on the [Settings...] button.
Each screensaver will then show its own configuration parameters.