Ouch. For your Windows desktop (I recommend at LEAST Dual Xeon Processors running at 800 mHz a peice and a Gig of ram :)) You should save it as an animated GIF. Carrara will do this, but not well. Download Gif Construction Set for that. then turn on the Active Desktop and set it to the Gif file. A screensaver, I don't know about, but I can imagine that there are some freeware utilities for that... Good Luck, Hoborg