09.24.2002 - Microsoft explains how to change the Volume Licensing Product Key on computers running Windows XP SP1 (Q328874)

Because of changes in Windows XP Service Pack 1 (SP1), Windows XP-based computers that use a leaked product key that is known to be available to the general public may not be able to install SP1 or automatically obtain updates from the Windows Update Web site. This article describes how to change the Windows XP product key in a Volume Licensing installation. - View Knowledge Base Article - Q328874 - Visit Microsoft Corporation