This hapens when you updated your hardware or installed it to another computer. You can reset your registration code yourself. To do this, please log in to our website http://www.xshan.com and click "My Account" link on the right top corner. In "My orders" tab click the order and you should be able to find a "Reset registration code" button right to the registration code. Clicking the button should get your code reset. You can then use the existing registration code to unlock the software.