What you are trying to do is unfortunately against the rules at this forum. We will not be able to help you find ways to bypass the Genuine Advantage verification process for Windows. The fact that your friends windows is not a legitimate version means you will not be able to recieve help here. In case you need a refresher, the rules can be found here.
I encourage you to take some time to become familiar with the rules. If you have any quesions, feel free to contact any of the staff for clarification.
In answer to the question in the topic title, this link will hopefully answer the query:What Is Windows Genuine Advantage?
As explained above this thread is now closed.