Microsoft Windows 8.1 Pro OEM Key Global
With Windows 8.1 Pro, you can start from the desktop you've always known or the modern Start screen with apps as Live Tiles. You can use touch, your mouse or the keyboard – whatever's easier. And you can use the accessories you want because Windows is compatible with nearly all of them. Plus, you can search your PC, the web, the cloud and apps at the same time with Bing Smart Search. Just access the Search charm from the right side of your screen.
* It Plays as Hard as it Works - Windows 8.1 Pro gives you the power to quickly browse, watch movies, play games, polish your resume, and pull together a killer presentation — all on a single PC. Now you can organize up to three apps on your screen at once in a single view.
* The Start Screen - Personalize your Start screen with your favorite news, friends, social networks, and apps. Customizable colors and backgrounds and four different sizes of tiles make your device as unique as you are.
* The Apps you Want - In addition to great built-in apps for email, people, photos and video editing – you can also download thousands of popular apps from the Windows Store, including Netflix, ESPN, Skype and Halo: Spartan Assault.
* Security - Stay up to date and more secure with Windows Defender, Windows Firewall, and Windows Update.
* Speed - Windows 8.1 Pro starts up faster, switches between apps faster, and uses power more efficiently than previous versions of Windows, including Windows 7.
* Multitasking Made Easy - It’s easy to do more at once. Snap multiple apps side by side in a single view for easy multitasking.
* Mouse, Keyboard—and now Touch - Windows 8.1 Pro works harmoniously with various types of devices, including touch, mouse-and-keyboard, or both. Whatever kind of device you have, you'll discover fast and fluid ways to switch between apps, move things around, and go smoothly from one place to another.
* You Keep all your Files - If your PC is running Windows 7, your files, apps and settings will easily transfer to Windows 8.1 Pro.
* You Keep Familiar Programs - Programs that run on Windows 7 will run on Windows 8.1 Pro.
I used onether Key for intallation, but after change the key, to this one, i have no problems with the Online Activation.