Animation render problem

I am trying to render an animation, and for some reason it renders a squashed image, then another squashed image of the next frame, then put them together into one jagged image.
http://www.mediafire.com/imageview.php?quickkey=wmrruu5tknm&thumb=4
http://www.mediafire.com/imageview.php?quickkey=ijzhjnuzjwz&thumb=4
the first one is jagged one. the second is the squashed render.
does any one know what causes this?

Hi,

Disable Fields in your render options.

Thank you. such a simple problem.