http://windowshelp.microsoft.com/window ... er+windows
You must activate Windows within 30 days after installation.
Activation helps verify that your copy of Windows is genuine and that it has not been used on more computers than the Microsoft Software License Terms allow. In this way, activation helps prevent software counterfeiting. With an activated copy of Windows, you’ll be able to use every feature of Windows.
•Open Windows Activation by clicking the Start button ,clicking Computer, clicking Properties, and then clicking Click here to activate Windows now. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Registration is the process of providing information to Microsoft (such as your e‑mail address) to sign up for product support, update information, tips and tools, and other news about Windows. It takes only a few minutes to complete. Here's how:
1. Open Welcome Center by clicking the Start button , clicking Control Panel, clicking System and Maintenance, and then clicking Welcome Center.
2. In the search box, type register Windows online.
3. Double-click Register Windows online, and follow the instructions on the screen.