I have a video card that has provided dual monitor support in the past. However, I've just had to reinstall the OS (Win 7 Pro) due to an HD crash. Now the OS does not recognize the second monitor. I have installed the latest drivers for the monitors and for the video card (Asus V9520/TD). The latest driver for this card is for Vista, but having run with 2 monitors in the past I cannot believe this is an issue. Any idea what could cause this problem?