Rick, partly because of my own research and partly on the recommendation of an acquaintance who runs a computer repair shop, I use Avast in its new 5.0 version for basic real-time protection. Then, for something that might sneak through, I have Malwarebytes which has already been mentioned, which only would be turned on for a supplemental scan. In both cases the free version is fine.

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Enjoy the music, not the equipment.