Hello mtb1099,
Please go to
http://microsoft.com/genuine and click the Validate Windows button.
If it Validates as Genuine, you are fine.
If it Validates as Non-Genuine, you will be provided information on how to order a WGA Kit. A WGA kit consists of a Genuine copy of Windows (sent by mail) and a Valid Windows Product Key (sent by email) sold at a substantial discount.
Hope that helps,
Darin MS