I want to get an original window

Hi friends, this is me Albert here. I am a school going, student. And I am a gamer as well. As a gamer, I use my computer to play all the games. But the problem is that whenever I am opening my system it is showing that your window is not genuine. I don’t know what does it means. I have discussed to some of my friends and they said you need to get the original window but none of them suggested to me the exact procedure. So I hope that you guys will tell me.

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