I presume that you are using the Norton personal firewall software to perform that port check. The fact that you have the latest updates to your antivirus software only means that your PC is protected against the known viruses covered by the software. A new virus could come out today and infect your machine before you download the latest updates. At that point, you have a clean- up situation to deal with.
Dig Deeper on Security Resources
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.