I have received a message on one of my computers today saying that my trial subscription has expired, with a button to click to "Activate Now". This computer now does not have any Norton program running on it. This computer has had Norton on it a year or more, the subscription key for it has a valid date through 9/8/2015. I don't think I need to renew anything on this computer. How can I get the software back onto my computer and have the subscription for it go until the expiration date (9/8/2015)?