Hogwarts

The Manner For Activate Your Windows

1. Locate your product key.
    Microsoft product keys contain 25 characters divided into groups of five,
    and are located on the proof of license label attached to your DVD case or
    on a Certificate of Authenticity attached to your PC.
2. Click on the Start button.
3. Type activate in the Search box, and then press Enter.
4. Follow the instructions to activate Windows 7

More....
Visit : http://windows.microsoft.com/en-US/windows7/help/which-version-of-the-windows-operating-system-am-i-running