In case you can't see the screensaver one:
1. Click start and 'search'.
2. In the search box click 'all files and folders'.
3. In the box that pops up, type *.scr then click search
4. A list of screensavers will appear in the box. You can preview them by double clicking on each one.
When you find the one you want, right click on the file - send to - desktop.
And that should be it. There will be an icon on your desktop that will immediately start the screensaver.