The Product Key you entered is invalid. Key entered:

You cannot complete setup without a valid Product Key. To re-enter the Product Key, select "Re-enter valid Product Key" below and then click NEXT to return to the previous screen, and then retype the Product Key.

What to do if:
In the U.S or Canada, call the Microsoft Piracy Hotline at 1-800-RU-LEGIT. In all other countries, contact your local Microsoft subsidiary.