I am trying to render my movie so I can put it on a DVD, but whenever there is a lot of fast action the image doesn't look too great. It looks just fine in the my vegas preview window, but the rendered picture doesn't

Image in preview:
http://moviespoof.milneyfilms.com/Image1.jpg

Rendered image:
http://moviespoof.milneyfilms.com/Image0.jpg

I'm using the HDV 1440 24p project template and haven't changed any settings. I'm trying to render it as an .avi (NTSC Wide 24p, 2-3 pulldown) and I have this problem, same when I go to .mpg-2