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Windows not genuine message appears despite Windows stating it is activated

There is a Windows update that can cause this bug but it is resolved with a later update so the first thing to do is to put on all the latest Windows updates.

If this doesn't resolve the problem, the following generally will:

• Run command prompt as administrator
• net stop sppsvc
• cd \ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\SoftwareProtectionPlatform
• rename tokens.dat tokens.bar
• cd \Windows\System32
• net start sppsvc
• slui.exe

After running the last command a Window should appear and if all has been successful it will have re-activated.