Are you using Windows Vista? Then you might as well know that the licensed operating system installed on your machine is harvesting a healthy volume of information for Microsoft. In this context, a program such as the Windows Genuine Advantage is the last of your concerns. In fact, in excess of 20 Windows Vista features and services are hard at work collecting and transmitting your personal data to the Redmond company.
Microsoft makes no secret about the fact that Windows Vista is gathering information. End users have little to say, and no real choice in the matter. The company does provide both a Windows Vista Privacy Statement and references within the End User License Agreement for the operating system. Combined, the resources paint the big picture over the extent of Microsoft's end user data harvest via Vista.
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Forget about the WGA! 20+ Windows Vista Features and Services Harvest User Data for Microsoft - From your machine! - Softpedia