I had my system setup fine on windows 7, everyhting was working correctly on both displays. I am now using windows xp as win7 was just a trial. If i move a gaming window from my first display to the 2nd, the window just turns black, if i move it back across to the first display it will display the window fine. Im using 2 cards in my system a GTX260 (1st display) and a 7600GT (2nd display). Im guessing it must be something windows 7 is doing differently to windows xp, does windows 7 install other drivers or programs that would cause this to happen??