There are a couple of ways to rotate the computer screen, reports Alphr. One way is to hold CTRL and ALT and press the arrow key corresponding to the direction you want the screen to face. Alternatively, rotate the display through the graphics card's control panel.
To be able to use the keyboard shortcuts to rotate the screen, first enable rotation for the graphics card driver, explains liutilities.com. Do this by going to the Advanced button in the Settings tab in Properties. Find the graphics card driver, and proceed to Graphic Properties, then Rotation, and select Enable Rotation. One can also set rotation in the same place it is enabled, according to Alphr.