How to log on after computer ask to activated but cant activated

Hello,I went on my computer to activate it but i haven't got product key and i can't activate and i did try to activate on the phone but it won't work,i want to log on my computer and every time i type my password on it keep go to empty desktop and said "This copy of Windows must be activated with Miccrosoft before you can log on.Do you want to activate Windows now?" It won't let me log on my computer before i activate it How to log on my computer after i try to activate but i can't activate?