Help Please with Interactive WinDvd Creater


I’m downloading movies from the net and then burning them with the windvd creater. Some movies this process is fine. But with others somethins is going wrong.
When i preview the movie before burning it’s fine, but when it’s burning, and in the viewing box, two large and thick black lines on the top and bottom of the movie seem to shrink the movie so that it’s think and long. Does anyone unserstand what i mean? I hope so because I’d really like to get the blakc things removed so i can see my movie properlly.!!!