I have read a lot about how to solve this problem that vegas 7.0 doesn't want to import mp4 files correctly, it ends up with only the audio and not the video, I have installed a few things but it just won't work!
I have windows 7
quick time player 7.0.4
xp codec pack 2.5.1
Ligos LSX MPEG-4 v.2.00.25
Sony MPEG4 Video Decoder Pro v.188.8.131.523