Checking activation status in Windows 7
Here's a quick way you can check the activation status of a Windows 7 computer. Simply hold down the Windows key on your keyboard and press the BREAK key to open the View Basic Information About Your System page of the System utility in Control Panel. Then scroll to the bottom of this page and view the activation info displayed there. If you see "Windows is activated" then everything is OK, otherwise you need to activate Windows before the grace period expires on your system.
Mitch Tulloch is a Microsoft Most Valuable Professional (MVP) and widely recognized expert on Windows administration, deployment and virtualization. For more tips by Mitch you can follow him on Twitter or friend him on Facebook.