Click the approprate link for the desired screensaver and download the screensaver to your computer.  Go to your main Windows folder (usually in the C drive, a.k.a. My Computer) and drop the file in there.
Next, go back to your desktop and "Right Click" any empty space on your desktop.  Select "Properties" from the pop up menu at the bottom.  On the top tabs, select the Screensaver tab.  You will see a drop down menu for all your screensavers on your pc.  Simply find the screen saver you just downloaded from the site and hit Ok.

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