Win2K/XP64/XPMC cannot directly upgrade Vista

  
                     According to Microsoft's official Windows Vista-XP upgrade specification, there will be three current versions of Wndows that do not support direct upgrades.

worth noting:

1.Windows XP x64 does not support a direct upgrade to Vista-- need to completely re-install.

2.Winows 2000 does not support a direct upgrade to Vista-- need to completely re-install.

3.Windows XP Media Center Edition does not support upgrading to any Vista SKU.


Figure: Green is upgradeable, yellow is required to completely reinstall the system



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