David IMed me this follow up link to the previous link on Windows Genuine Advantage disabling computers:

Disable and Remove Windows Genuine Advantage Notifications Nag Screen » My Digital Life

Microsoft has released WGA Notifications application which effectively turned Microsoft Windows operating system into a ‘nagware’, with a “This copy of Windows is not genuine” warning. What the Windows Genuine Advantage Notifications application does what it will check your Microsoft Windows XP validity. If it found that the copy of Windows XP is not validated, not genuine, counterfeit, unlicensed, pirated, illegal, unauthorised or simply failed the Windows Genuine Advantage validation process, then the notification messages will appear at various places and time.

Disclaimer: This article is for informational and educational purpose only, as most information is found on various part of Internet. Readers should contacts Microsoft if their licensed or OEM software cannot be validated or purchase genuine software.