if you get an error, ’slmgr’ is not a recognized as an internal or external command….. , you may have to change to the system32 folder. use these commmands:
type: cd windows\system32
your prompt should change to C:\windows\system32>
slmgr command and options:
slmgr -dli (this will display the current activation/licensing info of the pc your on)
slmgr -ipk xxxx-xxxx-xxxx-xxxx (allows you to replace the current product key with the specified)
slmgr -xpr (shows expiration date of current license)
slmgr -upk (uninstalls current product key and i would assume puts license back to trial state)
slmgr -ato (activates current pc’s license)
Select your Country.
Select the Phone Activation option, and hold on for a real person.
Remember you have a licensed installation and MS only needs to confirm that to help you reactivate. Just explain what happened.