[angiepuller]

Try VLC or iMovie. They can rotate AVI files.

If you are still in trouble with VLC or iMovie, use Cicever AVI Rotator. It can help horizontally rotate AVI files from left to right and vertically rotate AVI videos between upside down. It is also able to rotate AVI files 90 degrees, 180 degrees or 270 degrees easily preserving the same video formats.