I have Windows 7 and I am using only one monitor. When I try to open any configuration window from Control Panel, the window opens into an nonexistent monitor, they "fly" to the right of the monitor and I can't see and can't use them.
I never had a dual monitor setup, but I can't even enter in the Graphics configurations, because the window will open in the nonexistent screen.
How can I bring back control panel on my screen so I can make use of it?