iRotate

Various circumstances might require the display to be at a certain angle and your video drivers don't come equipped with such a feature. iRotate is a tiny tweaking tool designed for Windows that allows you to rotate your screen. It's the one tool you need when you find out your video drivers can't help you in the “screen rotating” department.

Incredibly easy to deploy and use

It is one of the simplest applications we ever had the pleasure of working with, so users with any kind of experience level can deal with iRotate, no IT knowledge required.
Installing it is very simple, and at the end, iRotate places a shortcut in the system tray, so there is no interface you can play with.

Ease of access with hotkey support

Right-clicking the application will bring forth a menu where you can select technical support, display properties, or rotate the monitor (normal landscape, 90 degrees, 180 degrees, or 270 degrees). There are also hotkeys available, so maneuvering this program is done with ease.
Double-clicking iRotate in system tray will open the Display Properties window, where you can select display, resolution and orientation (landscape, portrait, flipped landscape, or flipped portrait), found in Windows.

Uses little of your system's resources

In addition, you can make text and other items smaller or larger (it requires you log off Windows in order to apply changes). When it comes to CPU and memory resources, iRotate is barely noticeable, so it doesn't put any strain on your computer system.

To end with

All in all, if you want to change the orientation of your monitor screen, and your graphic drivers are not up for the job, then iRotate is the simplest application that can help you do that. Moreover, integrated hotkey support let you achieve the desired screen orientation with minimum effort.