Windows 10: regarding my product key

someone else installed windows 10 on my pc via his email. now i have tried a few methods shown in this site to activate windows none of which is working. i am unable to retrieve my product key from the pc itself. what do i do ? plz help me with that [^_^]

:)

 

Product key regards.....................

I want my product key for ms office

 

Product key regards.....................

Hi,

For information and steps on how to get your Windows 10 product key, you can refer to the article on this

link.

If you have other questions, don't hesitate to reach out.

Regards.

 

Product key regards.....................

Sir, I want to get my product key for microsoft office which i'm forget . so for that what are the steps to be do to get my product key of my version . Whether is any way to get my product key ,Is there any chance to get product key in free of cost.
pls tell me as soon as possible.����������������