Activation differs from the installation process that requires a product code.

Instead, the goal of Windows activation is to establish a link between a licensed copy Windows and a specific computer system via your product key.

Such a link should prevent the same copy of Windows from being installed on more than one machine, as was possible with earlier versions of Windows.

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Information from your video display adapter, SCSI and IDE drive adapters, processor type and serial number, hard drive serial number and your network adapter Media Access Control address are combined to form a unique identity for your computer.

When you try to install the same copy of Windows on more than one PC and then try to activate online or by phone, the activation will fail.

If you choose not to activate Windows 7 during installation, you will see an Activate Windows Online Now notification in the system tray.

If you dont activate then, you will see and Activate Now message every day from day 4 through day 27.

You will get the Activate Now message every four hours until day 30.

After day 30, you will get the Activate Now message every hour, along with a notice that your Windows version is not genuine whenever you launch the Control Panel.

Windows 7 will also not perform any system updates after the grace period; access to the online Windows Update store will also be barred.

Finally, Windows will automatically turn your screen background image to black every hour despite setting a preference.

This behavior continues until you successfully activate Windows 7.

Even after entering the correct product key, the error persists.

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Now that we know how Windows activation works on Windows 7, lets see why this error occurs and how to solve it.

This problem occurs if the license validity interval has expired, or if the license is not signed correctly.

If you are trying to activate an OEM (original equipment manufacturer) version of Windows, your product key should be on a sticker under, at the side or behind your computer.

If you are activating a retail version (bought a DVD from the store) then your product key should be inside your DVD or stuck to the side or on top of the DVD.

Make sure you input the correct product key when activating Windows.

Watch this video from YouTube for more information on counterfeit Windows 7 products.

You will required to give the mentioned numbers to the other person, who will in turn give you a Confirmation ID, which you will need to enter.

The Product Key on the sticker should have 25 characters in this format: xxxxx-xxxxx-xxxxx-xxxxx-xxxxx.

If the process was stuck halfway, rearming will solve the issue and enable you to activate Windows.

Or Press windows key R to open run, type SLUI 1 and activate your PC.

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