You don't need a computer with a monitor that can physically rotate to change the screen orientation of your Windows display. By default, Windows displays your screen in Landscape mode, but you can rotate the screen's orientation in 90 degree increments using the Screen Resolution utility and the Display section of the PC Settings utility. Both utilities come preinstalled on Windows, support screen orientation for multiple displays and are available on both laptop and desktop computers.
Rotate Your Screen Through PC Settings
Press the "Windows-C" keys to open the Charms bar, then select the "Settings" icon.
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Click "Change PC Settings," then select "PC and Devices."
Select "Display," then click the "Orientation" drop-down box. If you have more than one display connected to your computer, select the display you want to change, then click the "Orientation" drop-down box. If you are having difficulty identifying your displays, click "Identify" to view a display number for each of your displays.
Select your desired orientation -- such as "Portrait" -- from the drop-down box. The other available screen orientations are "Landscape," "Portrait (Flipped)" and "Landscape (Flipped)."
Click the "Apply" button, then click the "Keep Changes" button to save the new orientation.
Use the Screen Resolution Utility's Orientation Feature
Right-click an empty area on your desktop, then select "Screen Resolution." If you have multiple displays, click the "Display" drop-down box, then select the display you want change. If you cannot identify your displays, click the "Identity" button to view a display number that corresponds to each display.
Click the "Orientation" drop-down box, then select the orientation you want to use, such as "Landscape (Flipped)."
Click "Apply," then click the "Keep Changes" button to save the new orientation.
Click the "OK" button to close the Screen Resolution window.
On some supported laptops you can change the screen orientation with a keyboard shortcut. Press the "Ctrl-Alt" keys and the appropriate arrow key to change the screen orientation. For example, press "Ctrl-Alt-Left Arrow" to change the screen orientation to Portrait mode.
Information in this article applies to Windows 8.1. Instructions may vary slightly or significantly with other versions.