What is very strange for me is I was able to performa a clean install form Microsoft disks. Windows 8 worked fine until it requested me activation code. I did worked ( of course 
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Trying to update form past windows didn't worked for me. Just magic mouse and keyboard, all other devices vere "dead" after installation.
Answer form Microsoft guys: buy a Windows 8 boxed version.
I'have paid for XP, VIsta and 7. Why tey don't ask me simply for an older version activation code ?
PS my sister has a "real" pc and al the time I used W8, I didn't apreciated diferences between my vm and pc.