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Norton Utilities and Norton Security are two completely separate product lines that serve two different purposes.
Norton Utilities is a PC maintenance program which keeps it optimized and working well in terms of performance. Norton Security provides security features such as an antivirus and a firewall to keep you safe online.
You should run a security program, whether it's Norton or a competitor's product, to make sure that you don't get attacked by hackers or viruses.
If you have any other questions on this, just let me know and I'll be happy to help.
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