I would watch what you update in future then!
"The Windows Genuine Advantage Notification tool notifies you if your copy of Windows is not genuine. If your system is found to be a non-genuine, the tool will help you obtain a licensed copy of Windows."
I would hardly call having to spend £90+ an 'advantage' though, and the tool to 'help you obtain a licensed copy' sounds extremely patronising as I'm sure most of the people without licenses are more than aware!
Not that it bothers me, I'm running a genuine copy that came with my PC!