Windows Vista Starter/Home Basic

Windows Vista Starter/Home Basic
has all the basic features as its name explains but its also 79% more responsive than windows xp home/pro. It has new Windows Vista feature Windows Sidebar, too. It doesn't include
* Domain member feature
* Windows Media Center
* Windows Aero
* some small parts

Starter Edition is pretty light weight compared to Ultimate Edition.
Starter Edition = 5700 MB*
Ultimate Edition = 7689 MB*

*approximately