作者chaotommy

http://www.microsoft.com/oem/en/licensing/sblicensing/Pages/what_to_do_downgrade_rights.aspx


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Q. Who can install the downgrade software?

A. A system builder (when authorized by the end user) or the end user can install the software.

A Windows Vista Business or Windows Vista Ultimate media disk is needed to facilitate the downgrade from Windows 7 Professional or Windows 7 Ultimate to Windows Vista Business.

A Windows XP Professional media disk is needed to facilitate the downgrade from Windows 7 Professional or Windows 7 Ultimate to Windows XP Professional.

A Windows XP Professional media disk is needed to facilitate the downgrade from Windows Vista Business or Windows Vista Ultimate to Windows XP Professional.

N...