Windows Licensing Links:
Here are some useful links with regards to Windows Licensing
TechNet site for Volume Activcation:
www.microsoft.com/technet/volumeactivation
Product Key information, resources and call center telephone numbers:
www.microsoft.com/licensing/resources/vol
Microsoft Licensing home page:
www.microsoft.com/licensing/defauls.mspx
Genuine Microsoft Software:
www.microsoft.com/genuine