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Issue
I get an error message: Windows must be reinstalled to activate
Resolution
If Windows is not automatically activated, you can correct this in just a few steps, usually without the need of a reboot.
In the command prompt:
Type: net stop slsvc (It may ask you if you are sure, select yes)
Type: cd
%windir%\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\SoftwareLicensing
Type: rename tokens.dat tokens.bar
Type: cd %windir%\system32
Type: net start slsvc
Type: cscript slmgr.vbs -rilc (It may take a long time for this to complete, please be patient)
The licence should now be able to be reactivated without a full reinstall.