For those of you who would like to run a video (rather than pictures) as a screensaver, I put together that easy instruction on how to do it. Please note, that this does not work with very basic on-board graphics chips like the Nvidea 6159LE or the ATI 3100. The video filetype should be .wmv.
On second thaught, I wonder whether it would work on a "native" Win7. I run Win7 in a vBox virtual partition. My "native" Win7 is on my machine in Florida where I am only in November. If one of you guys could check whether it would allow you to make the settings on a "native" Win7, we would know better.
I got this idea because I know that it does not work with the quoted low end on-board graphics chips either. Maybe running in a virtual partition has a similar effect because the graphics capability is restricted.