but when i set the sat box to it part of the menu goes off of the screen and I have to recenter it
How do you recenter it? What are you doing to recenter it?
then when I go to the channels that are shown in 4.3 with the bars on the left and right not top and bottom
You use the expand/format button on the tv remote to stretch the picture so there is no black bars on the sides. What brand,model,type of tv do you have?