Rendering Problem

hi im having a bit of a problem rendering. whenever i try to render the rendering window pops open but the image only fills the bottom half of the box. then when it finishes rendering it stretches up to fill the whole box which, as you can imagen makes my scene look horrible. not sure what to do to fix it.

thanks

The Original Deviant

In the render settings there is a button called Fields. Make sure you have not selected it.

man i could kiss you!! its been annoying me all day!! thanks!!