First of all Open your Command Prompt (Cmd) as an Administrator.To Open it as an Administrator GO to Start-menu and Type cmd then Right Click on the Cmd and click on Run as Administrator as Shown below in the Image.
Now Type the Command SLMGR -REARM in cmd as Shown below in the Image
AMessage Dialog Box Will open Specifying Command ‘ Completed Successfully.‘ as Shown below in the Image
Restart Your Computer and done.Now You are Free of the Error ‘Windows 7 is Not Genuine’
Important Note - You Must Run Command Prompt as an Administrator Else this Method Will Not Work
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