Hello, I have already had my case closed by Microsoft, with no resolve. I upgraded to Windows 7 pro. from vista home premium. I have always used my duel monitor set up, one dell and one Sharp LCD screen. From Xp to Vista. Now that I have 7, it will not work no matter what. I have all the most recent updates and have check everything with Microsoft. I have a dell Xps 420, Nvidia GeForce 8600GTS video card. 4 gigs of ram with a quad core processor. please excuse any lack of info.. I just need help, I am a photographer and used both screens all the time to edit.