Type the following to install a generic client key (this example is for Windows 7 Professional): slmgr /ipk FJ82H-XT6RQ-28P2M-W9K7P-X9CDX Attempt to activate by typing: slmgr /ato
Microsoft allows a 30-day grace period without a product key. You can extend this up to 3 times using the slmgr -rearm command, giving you 120 days total. how to activate windows 7 without product key