Your Windows computer screen may suddenly appear upside down or sideways. While you may think this is cause for alarm, it is not. Most likely, you accidentally pressed a specific key combination on your keyboard. Perhaps you set something down on your keyboard. Regardless of the cause, you can easily change your Windows computer screen orientation. Note that the steps described in this article apply to the Windows XP, Vista and Seven operating systems.
Log-in to the Windows operating system.
Close all programs.
Press "Ctrl" + "Alt" and press the "Up," "Down" or "Right Arrow" key to rotate the Windows screen.
If the computer screen is completely upside down, press "Ctrl" + "Alt" and press the "Up" arrow to rotate it right-side up.