I have to two monitors in my Dell Dimension E521, both showing the same thing in Windows XP. Online it says to right click the desktop and press personalise, then go to settings. But when I go to settings, I have a different screen to who was recording the tutorial. I'm looking for a screen with a dropdown menu to enable 2 monitors, but instead I get just a slider to change the screen resolution. It's as if it doesn't know there is another monitor, yet both my screens are appearing in the device manager. Can someone please help me fix this issue?