If Office was working fine and all of a sudden started having this problem, you can always try a system restore.
If not, keep reading! Method 2- System Restore It should stay activated even after restarting. At this point, if it activated successfully, you can change the time back to the current date and time. Now go ahead and find your product key for Office, which is usually on the packaging and type it into the box.Īfter you are done, you can launch any program in Office and do the activation. Now, check the radio button next to “ Enter Product Key” and click on Next.