Windows Genuine Advantage (WGA) is an anti-piracy system enacted by Microsoft that attempts to force users of Microsoft Windows to validate the authenticity of their copy of several recent Microsoft operating systems when accessing several Microsoft Windows services, such as Windows Update, and downloading from the Microsoft Download Center.

100% working on Windows Update and Microsoft Download Center .

And still, this does NOT work with IE7 and WMP11. Both uses their own wga check that is in their install program.
Install Notes: 1. Extract into a new empty folder 2. Run installer.bat ... more