I have a dell XPS 400 Dimension and about two weeks ago most or all of my dell installed screen savers just disappeared.  When I go to the screen saver window and select the screen saver that I want to use and click on preview all that comes up is a black screen.  When the screen saver comes up it is just a black screen.  I have a few screen savers that work but I lost all of the dell installed screen savers.  Anyone out there have any Ideas.

Mike