Rotate Screen in Windows 8

Right-click on desktop
Select Screen resolution

If you have muliple monitors, select the monitor whose setting you want to change.

Select the appropriate option from Orientation List Box.

 Click OK


Keyboard Shortcuts
CTRL + ALT + Up Arrow = Landscape [default]
CTRL + ALT + Down Arrow = Landscape (flipped)
CTRL + ALT + Left Arrow = Portrait
CTRL + ALT + Right Arrow = Portrait (flipped)