Microsoft distributes the *Windows Genuine Advantage Notification Tool (KB905474)* through the WindowsUpdate mechanism.
This tool should detect fake Windows serial numbers and nag the user. Interestingly, Microsoft hid a small paragraph in
their EULA after that the tool sends daily(!!) reports to Microsoft. According to MS this "is neccessary" since the
tool is BETA and MS needs to be able to react if it goes crazy. Yeah … sure!
Sadly, if you installed it by accident, there's no easy way to remove it. No entry in the *Add/Remove Programs* window.
You could restore a backup of your disk or use *System Restore*, but after some Google'ing I found [this site](http://www.mydigitallife.info/2006/04/26/disable-and-remove-windows-genuine-advantage-notifications-nag-screen/)
which lists 16 ways to remove the WGAN.
The first method seemed to be the best and so I used [AutoHotkey](http://www.autohotkey.com/) and automated it.