Windows Key not working after installing new motherboard

Upgraded my mptherboard and cpu a few days ago, when i turned my pc on i noticed a popup that said activate windows. when i went to the settings it said that my key was already being used by a pc. anyway around this without calling microsoft? 

what version of windows are you running?If latest version of win 10, you can run a troubleshooter (see ( but you may need to call them anyway)its likely the PC your key thinks its tied to is your old PC. 

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