Ok I just install Windows Vista SP1 and could say that is a little faster and use a 15% less of memory that is good.Boots faster!!; that is all I can said for the moment! My native language is spanish and the language pack doesn't work with this version you can download it but the OS don't le you install it.No problem to activate it. Other thing that I don't like is the announce in the right down corner that is reminning you that is a evaluation copy even if you active it.