I have a new 42" Visio HD Flat Screen TV connected to a Dish Network 722 DVR. I am having problems in setting up the vertical and horizontal edges to where hd programs fill the screen, without the guide running off the edges. Whenever I set an hd program to the screen edges, the guide flows off the screen. If I then shrink the guide to the edges, the picture shrinks so it no longer fills the screen. Does anyone know how to keep the guide from flowing beyond the screen, if the hd picture fills the screen? Thanks....