My window 10 pro licence will expiere soon and i not know about my product key. How i activate my window?

[waseemAhmed6]

I bought my laptop few month ago from retailer that time the window was working properly. After a few month when I turn my laptop ON after login it give message.'' Your window will expiare soon you need to activate it''.The window was already install on my laptop when I bought it therefore I not know about my product key. ''please give me full guide about the problem.''

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