when i try to p[lay champions of norath i only get half a screen can any one tell me why?
Try with a (Software) renderer in GSdx graphic plugin.
when i do that it slows it down extremely
Well if the software renderer fixes it I doubt you can do much about it in (Hardware), you could try some frameskip to speed it up (Shift+F4 in pcsx2 0.9.7).
Oh... maybe try other graphic plugins like ZeroGS or ZZOgl.
Try pressing F5 during gameplay.It changes interlacing modes so try it
interlacing mode has nothing to do with the emulator showing ONLY the half screen (this is a graphic bug and its only solved as shadow lady said)