hey
this program is called removeWGA and according to their website it says:
"RemoveWGA enables you to remove the Microsoft "Windows Genuine Advantage Notifications" tool, which is calling home and connect to Microsoft servers every time you boot or every two weeks"
http://www.eweek.com/article2/0,1895,1979756,00.asp (the story about the program)
http://www.firewallleaktester.com/removewga.htm (the program)