Right click on an empty space on your desktop.
Windows vertical screen.
In windows vista select personalization and then click the display settings option.
Windows 7 8 and 10.
On windows 10 you ll be taken to the settings system display window.
Select the monitor whose orientation you d like to change.
Click on catalyst control center to launch it.
Select your orientation click apply and then ok non windows 10 users.
To change your screen s orientation from vertical to horizontal if you are using an amd gpu you need to.
A window should open similar to the one shown below.
In windows xp select properties and then click the settings tab.
Under orientation click the down arrow at the edge of the box.
Locate the orientation option under resolution click the dropdown menu under it and then choose your preferred screen orientation landscape portrait landscape flipped or portrait flipped.
While holding the windows key win key if you press the left or right arrow key the window that is currently focused will be moved to the left or right portion of the screen respectively.
In windows 7 and 8 this can be accessed by right clicking on the desktop and selecting screen resolution.