Hello Arshadmalik,
I don't understand the question. Do you mean Product Key? Are you having problems Activating? and/or are you getting a Non-Genuine message?
Please provide additional information regarding the issue you are seeing.
In order to receive the best support, we also request that all users initially download and run the Genuine Diagnostics tool (MGADiag.exe) at this link http://go.microsoft.com/fwlink/?linkid=52012. Click "Continue", click the "Copy" button then “Paste” the report into a reply message in this thread.
Thank you,
Darin MS