If your copy of Windows is not activated, you will see the option Activate Windows. Then click Settings and then Change PC settings. To do this, press the Windows key + C to access the charms bar. You can activate Windows 8 from the PC settings app. However, you will not be able to access its premium features. You can also install the software with a generic Windows 8 professional product key and continue using it without activating it. Luckily, you can find free product keys online. If you don’t have a product key, it might be impossible to install and activate the Operating System. You must provide a working Windows 8 professional product key to proceed with the installation. When installing Windows 8, you will be required to provide an activation key. What Do You Need in Windows 8 Professional Product Key?

Download and install Windows 8 professional using a free pro product key on this page.

Purchase a computer with pre-installed Windows.

Purchase and install Windows from Microsoft using the provided pro key.

If your PC doesn’t qualify for the upgrade, you have the following options:

Wait for Windows update files to download and install.

If your Windows PC meets the system requirements, you will be able to download updated files.

The upgrade wizard will determine the hardware of your computer.

Launch the Windows 8 Upgrade Assistant on your computer.

Otherwise, you will be required to buy a genuine copy of Windows 8 and get a pro product key along with it. If your PC is running a genuine copy of Windows 7, you can easily upgrade to Windows 8 without paying the additional license fee. We update these keys regularly therefore, you can be sure you find a working Windows 8 professional product key at the end of the day. If none of the keys work for you, feel free to bookmark this page and come back tomorrow for updated keys. Note that you can only use a product key Windows on one computer. MUST READ Microsoft Office 2010 Product Key and Activation Guide

Win dows 8.1 pro