Why did my windows just deactivate itself?

[Tyler Day77]

A message popped up that i need to activate windows. I have bought a product key late last year and used it when i upgraded my hardware in my computer and has worked ever sense. There has been no changes since then and when i had my PC on last night it was fine but now it is showing Error code 0xC004F012 not having a valid digital license or product key.

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