So, you have one regular monitor and one widescreen monitor. Right? It may not matter but does your video card have two DVI connectors or one VGA and one DVI?
I run dual monitors but they're both 17 inch CRT, set at the same resolution (1024x768). So, I'm not sure I can help you with this, but let's see whether someone else from the posse has some thoughts.
I do wonder whether the two different types of monitors is making this more complicated for you.