Create an animated Avatar

Step 2 Get the screenshots

Open up movie snapshot. It has a pretty simple intercface. Just use the Folder button to browse for your movie file and open it. It'll automatically start playing. When you get to the part you want to get the pictures from, push the pause button. You can use the << and >> buttons to advance or retreat by one frame, and the diskette button to save a picture.
It's a good idea to get something that will be short, simple, and loop easilly. I chose three frames of Bart and Lisa screaming from an episode of the Simpsons.

UPDATE: If you'd like to do this step with VirtualDubMod; open it up, then push Control-O to browse for your video file and open it. You can use the arrow keys to advance one frame forward and backward, or use the arrow buttons at the bottom. You can also use the slider bar, to move quickly through the movie. Once you've found the first frame you want to use, push Shift-1 and it will pop up with a little window, asking where you want to save it. VirtualDubMod defaults to saving in the .TGA format, which you really don't want to do. When saving pictures from VirtualDubMod, choose Bitmap (.bmp) as the output format, because it's a format everythign can open, and it doesn't compress the data. After you've saved the first picture, just advance the video by one frame and save again until you got the whole length of the video that you wanted to use, just like normally.