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Reactivating Computers

Periodically, Windows 7 and Windows Server 2008 R2 check the hardware configuration of the computer on which the operating system is installed. If the operating system detects that the hardware has changed substantially, reactivation is required. The actual weighting factors and threshold values vary , because these values must keep pace with the constantly evolving computer hardware market. In general, computers that use MAK activation use the same reactivation rules as retail activation. KMS clients focus more on hard disk changes to determine the need for reactivation.