Office 2016 Activation Problem

Hi guys!
Just installed Office 2016 apps and got a little problem.
While trying to login to office through Word for the product activation, the sign in window pops up but only a background picture is loaded (no type boxes).
I reinstalled windows 7 and office after formating my PC, bought it a long time ago so i don't have the activation key. Still have the lisence, so i guess after loging in into my account everything will work. Any other way to login for activation or any solution?

Thanks in advance:)
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