When watching a SD show black lines right and left on screan

[nec1912]

So I have a HD TV 1080P and the show is 4:3 aspect ratio that is why there are black lines on the right and left of the screan.

But the edges seem to be fuzzy and have artifacts.Some times on edges it red like it bleeding in from sun exposure.It is if the video camera the cameraman are using had problem at the edges but does not show up on a 4:3 aspect ratio do to the edges cut out but on a HD TV 1080P it show up.

I cannot use the set top box to zoom in or stretch the screen has people look really really really really fat ( and they are not ) or the picture on the top and bottom is cut off.So I cannot zoom in or stretch the screen .

And doing nothing I get black lines on the right and left of the screan and the edges seem to be fuzzy and have artifacts.

Why is that and what should I do?

Some shows for what ever reason have letterbox a black line on the right and left and top and bottom .Why is that?