Here’re some posts links that will help you in activating Windows 7 OS to help Microsoft fighting piracy:

• Activating Windows 7: A video that outlines the customer experience of product activation and why it's important.
• Windows Activation Technologies - Activation and Validation in Windows 7: Read more about the next generation of product activation technology that started with Windows Vista and has been updated for Windows 7.
• The Surprising Risks of Counterfeit Software in Businesses: Key research that our team supported; a white paper about the risks businesses face when counterfeit software exists within their computing environments.
• What's the risk?: Foundational research that documents the risks customers might face when searching for free or heavily discounted software online.