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The poke and hope approach to security is laughably ineffective these days. For example, Norton Antivirus by itself is woefully inadequate. Just installing a full security suite is only a little better.
You need to take the trouble to understand the threats, use a thorough approach, maintain vigilance, and perform regular upkeep to be relatively secure online. In other words, it takes work. Sorry. ;-)

My 7 Action Steps for Online Security make a good recipe for stout online defense. I used Albert Einstein's maxim, "Everything should be made as simple as possible, but no simpler," as my guide in putting this plan together. :-)
You need to take further precautions when you use a public internet connection, for example, WiFi hotspots or motel Ethernet.