Windows operating system is a very user friendly and easy to use operating system. It will help you to complete the technical tasks either profession or personal. However, you will see some error issues in Windows due to which the performance or functioning gets disturbed. When you try to log on to the Windows, you may get Windows is not genuine error on the screen and your computer will get stick at certain point. You will not be able to go ahead without resolving this issue now. It mainly happened when you are not running the genuine copy of the Windows OS or your license gets expired. In this situation, you should go with some manual or automatic error fixing method. You can also use Advanced System Repair tool in the computer to fix the issue automatically.