I am getting an error message, and told that "Core product file(s) have been modified. Please run Smart update or reinstall the product." When click on OK button of warning message, the user interface of Norton Utilities 16 (Version: 16.0.2.14 and Engine 5.0.0.5) loads as usual. I had installed Windows 7 SP1 (genuine copy) on my PC, and have the Internet Explorer version 11.0.9600.17420. I and some others got the same error message almost a year ago on 25th November 2013, and later it was solved through Norton Community forum.
URL for the previous error message reporting dated 25.11.2013:
https://community.norton.com/comment/5079053#comment-5079053
Please be kind enough to get rid of this error message. Thank you.