Has one of the displays been rotated 180 degrees?
EG; If you drag a window from one screen to the other, does it turn upside down?
Ahh. Vertical spanning.
It seems your GeForce 7900 GS supports vertical spanning. I've not see this before but apparently if you double the vertical resolution instead of the horizontal resolution you end up with a vertical span.
Right click any empty part of your Desktop and select the Nvidia control panel. Look through there for clues.
Hi, I recently added a second monitor to my desktop, but the mouse transfers from one screen to the other by going up my main screen and into the bottom of the second screen. How do I adjust this so that it transfers right or left?
I'm using xp home and my graphics cards is a GeForce 7900 GS.