there was a screensaver program that I use to use that does it. I think it was called screensaver xp.
The Ultimate Hard Drive Utility PowerMax 4.23. (It now has the ability to clean a Boot Sector virus on the quick erase option.)
The best browser Netscape 8
Have you accidently delete something? Look here (trial. the better one) and here(free)
Thinking outside the box......you could just create a simple html page and embed a video clip and then set the html page as the background. I used to set html pages as my background for various other tricks. As far as a a slide show you could use the several free "myspace" slide shows to put on this html page you create.