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The mcafe is like Nortons that comes along for the ride on many new PC's with a host of baggage attached, if you're wise it's the first thing you boot off a new PC.
We've been, our household of andropid handsets, including Samsungs, use AVG free, it has several times picked up nasties and doesn't weight down your handset operation. It is especially good at scanning software or app up dates that come through from the google play store and has saved some heartaches on the grandsons phone. He's into all these free apps that have issues.