How does WGA differentiate the genuine Windows Vista user experience?
WGA for Windows Vista enables Microsoft to differentiate the genuine Windows Vista user experience by reserving key product features, including Windows Aero, some features of Windows Defender, Windows ReadyBoost, and Windows Update as optional updates for customers running a genuine, properly licensed copy of Windows Vista. If you’re running a non-genuine copy of Windows Vista, the lower right portion of the screen will display a message that reads, “This copy of Windows is not genuine.” Note: Windows Aero is not available in Windows Vista Starter edition or Windows Vista Home Basic edition.