Verify date and time in Settings. Check how to run SFC below. In this situation, activation is typically managed by your organization, and you’ll need to contact your system administrator for assistance. If your device was recently repaired at an independent repair facility, contact them to see if the repairs require a new Windows 10 license. Product keys are unique—assigned to a specific user to install on a single device.
 
 

Windows 10 key activation error free download.Windows 10 Product Key Free Download

 
For more info about how to activate Windows 7 or Windows 8. Any additional feedback?