If you've just installed Windows 7, you may be feeling a bit hassled by the Windows validation messages that keep popping up. These messages indicate that a product key was not entered during installation. Genuine Windows Validation is Microsoft's way of preventing software piracy. Though you do not have to enter your product key right away, you will eventually be unable to log in to your machine if you go too long without validating your software.
Visit the Genuine Microsoft Software website (see Resources). Click the blue "Validate Windows" button on the left side of the page.
Install the required browser plugin by clicking the "Download" button. If you are using Internet Explorer, this step is not necessary. If you do not wish to have additional browser plugins, you can uninstall it once validation is complete. Once the plugin is installed, click the "Continue" button on the Genuine Microsoft Software page.
Wait for your validation results. Scanning your machine may take a few minutes. When prompted, enter your Windows product key. If you've installed Windows 7 from a CD, look for the key within the CD case. If you've purchased a digital version of the installation files through the Microsoft store, the key should have been emailed to you.