Why wont my videos from my flip video camera not work with sony vegas 7?

CAN SOMEONE PLEASE TELL ME WHY! IT ONLY SHOWS ME THE AUDIO AND NOT THE VIDEO! I NEED TO EDIT THE VIDEOS! I TRIED REINSTALLING IT AND THAT DIDN’T WORK! PLEASE HELP ME!

Use one of these to convert it to an avi file first!
Super© What it does

http://www.erightsoft.com/SUPER.html

Super© Download

http://www.afterdawn.com/software/video_software/video_encoders/super.cfm

Any Video Converter

http://www.any-video-converter.com/products/for_video_free/

d;o)

Tutorial for multiple camera editing in Sony Vegas Studio