EULA

"It is clearly stated in the EULA (or an addendum to the EULA) that Microsoft can and will make changes to Windows whenever they find necessary."

Laws over ride EULAs. Besides, just because the EULA says they're allowed to modify Windows at any time doesn't mean it allows them to break Local Law to do it. It's like buying a clock off a clock maker and you agreeing to allow him to add stuff to it later on. One night he breaks your window with a brick and does some updates, then leaves. ;)