Many users have asked us about this, and perhaps it's happened to you... Have you turned on your computer recently to find a pop-up from Microsoft on your screen for Windows Genuine Advange Notifications - Installation Wizard?
We advise all clients to be VERY cautious when they see something they don't recognize on their system. This recent deployment by Microsoft is unfortunate, because the window that pops up looks just like all the bogus AntiVirus 2009 and other malware threats that have circulated around recently. Many users have been alarmed by it.
The Window Genuine Advantage program is Microsoft's Anti-Piracy program. The sofware detects if you have a legal license, and will warn you if you don't. If your software is not legal, then you won't be eligible for automatic updates (except for Critical updates). The problem is that if you are an honest customer, you've already paid and this is a real nuisance. If your system is set to get Automatic Updates with Automatic Installation, then this would have been automatically installed. Typically, we recommend selectively installing updates to avoid things like this.
Microsoft is getting some angry feedback from customers, so I would hope they'd change this in the future.