Originally Posted by Ara T.

I don't see how thats possible unless you are pressing the same directional arrow for both windows.

Instead of the keyboard shortcuts, try dragging one window (first hit the button on the right hand corner in between the minimize button and the close button to shrink it down) all the way to the left of the screen with the mouse until it locks in place (keep dragging it as far as you can until a graphical animation shows) and do the same with the other window, on the opposite side of the screen.