There are plenty of apps to make your movie into a screensaver, but what about going the opposite direction ? I have a great screensaver that I want to make into an AVI (or any video format).
Spirit: go to www.rendersoft.com and download FREE (yee-peeee!!!) CamStudio. It will enable you to record what's on your screen in AVI files. You can even crop a precise area on your screen to be recorded if you want. And with sound... if there is some.