Windows Vista ships with some lovely screensavers like the Bubbles, Mystify, Ribbons and our favorite Aurora Screen Saver.
Fortunately, you don't have to upgrade to Vista to run any of these Vista specific screen savers. The good folks at JoeJoe have ported these popular Vista screensavers to run on Windows XP or even previous versions like Win 2000.
Download Vista Screensaver Set [rar format]
Just download the above file and unzip the .scr screensaver files in your Windows installation directory [defaults to c:\Windows] - The instructions to customize the various settings of these screensavers are mentioned in the text files attached with each Vista screensaver.
Related: Download Google Screensaver