I haven’t changed any hardware in over 6 months,

…yet I got this message when I logged in today:

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Windows Product Activation
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Since Windows was first activated on this computer, the hardware on the computer has changed significantly. Due to these changes, Windows must be reactivated within 3 days.
Do you want to reactivate Windows now?

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Yes No
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Very strange. Any ideas?

(Tip: you can capture the text of many Windows dialogs into the clipboard by pressing Control-C while viewing them. The above example came that way. Couldn’t use printscreen while logging in, tho, or I’d’ve shown the dialog too.)