Movie Maker Problem

Ok, playing the file is fine in movie maker, but when I try to make a video... the video won’t show up, but the audio is heard... help?

Check if you had Divx and Xvid

The file C:\.avi cannot be imported because the codec required to play the file is not installed on your computer. If you have already tried to download and install the codec, close and restart Windows Movie Maker, and then try to import the file again.

The file C:\.avi cannot be imported because the codec required to play the file is not installed on your computer. If you have already tried to download and install the codec, close and restart Windows Movie Maker, and then try to import the file again.

\RYAN\PERSONAL\Picture Edited\Church\11-23-2008\20081121223028.mpg could not be imported. Unspecified error

I can’t publish my video. I need help.
thanks.