weird weird message please help me

[dvd3__]

i get this window message every time i start up windows and log into main screen

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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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i have activated and i have not installed any new hardware or software can someone help me please

thanks

 

[g-paw]

Suggest you call Microsoft and reactivate it