Windows licence activation
The UIS switched their Windows licensing server from kms.csx.private.cam.ac.uk to uis-kms01.blue.cam.ac.uk.
Therefore on expiry of your current windows licence, which used the old server, then your machine will need to be redirected to use the new server to re-activate Windows.
Instructions
If you do not run the command prompt with elevated rights, it will not work.
Search for “CMD” and right-click the command prompt and select "Run as Administrator"
Enter slmgr.vbs -skms uis-kms01.blue.cam.ac.uk
(Response: Key Management Service machine name set to uis-kms01.blue.cam.ac.uk successfully.)Enter slmgr.vbs -ato
(Response: Activating Windows Professional/Enterprise edition.)