Problem:

Windows is sending notifications informing the user that their Windows license is expiring soon, or has already expired.


Causes:

Enterprise and Education Windows licenses expire if they do not connect to their domain for an extended period of time. This usually happens with students who are studying abroad.


Solution:

First, install Global Protect if it is not already installed.


Make sure you are connected to the vpn during this process.


Activating Windows
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1). Open Command Prompt by searching the Start menu for "Command Prompt" 
2). Once in command prompt enter this command, "slmgr /ato" this command should activate Windows. It might take a few minutes.
3). Now check to ensure that Windows is activated by using this command, "slmgr /dli" this should show a window that tells you if your computer is activated or not.