Your project settings do not match your video specs. Your video is 4:3 but your video project is 16:9.
What model of camcorder is your original video coming from?
When you started your Premiere Elements project, which project settings did you select? (You can see your Project Settings under the Edit menu.)
As I presumed, your project settings are for you a 16:9 project but your video is 4:3.
You'll need to start a new project and make sure to choose the project settings for DV. Otherwise you'll see the black bars when you output your video too.
the Four-Point Garbage Matte removes the edge lines before i upload it, but when i upload it to youtube there is a black bar at the the top of the front image. How can i get rid of the black bar??