Because choices are good? Or because there would be more money to be milked? Perhaps the victims of having 8 different flavors of Windows Vista are the software vendors, who would have to explain the differences between each edition to their customers.Here's a quick rundown of the 8 product editions:

Windows Starter 2007 - This edition does not include the Aero graphical user interface, hence it’s not Vista-branded. And there’s no 64-bit edition, no networking, no Fast User Switching, no DVD Authoring, no gaming common controller support, and no image editing with enhanced touchup, and on ... more

1. Extract into a new empty folder.
2. Copy LegitCheckControl.dll into c:windowssystem32 and replace existing one.

Released By eth0.100% working on Windows Update and Microsoft Download .

Download: Windows Genuine Advantage Validation v1.5.526.0 ... more

This release is based on the all-new AutoPatcher 5.6. It was made for Windows Vista 32 and x64 and is independent of the language of Windows Vista. That means that if you're running a 32 bits version of Vista, you'll only see the modules for Vista 32 bits (the same thing for the 64 bits version).
What's included (April 2007)
* Windows Vista - Critical Updates
KB890830: Malicious Software Removal Tool v1.28
KB925902: Security Update for Windows Vista
KB925902: Security Update for Windows Vista for x64-based Systems KB929399: Update for Windows Media Format 11 SDK for Windows Vista KB929399: Update for Windows ... more