Sony Vegas 7 Se Help Sony Vegas 7.... 10 Points!!!!?

Help sony vegas 7.... 10 points!!!!? - sony vegas 7 se

Hello everybody, I'm writing from Italy, because nobody here knows how to help me if I have a problem with Sony Vegas 7, if a star like Sony Vegas to see the project only the audio of my video, why? Can someone help me? I do not know how all my videos is not possible to play alone? helppppppppppp
ps. my English is not very good sorry!
Let me ask you in Spanish!
The friends have a problem with Sony Vegas 7, quando tento osea a project all of my videos I make only audio no se porque! Can someone help me? Thank todossssss