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Do iMacs even need that stuff?


There is indeed a such thing as malware on the Mac, and so antivirus software is just as important there as it is on Windows.

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What makes her think that she has malware ?


Though Andy's question is valid, your earlier description, in another thread, of the way SWMBO "just clicks on things and installs them", is pretty much a textbook description of someone at high risk for malware infection.

Unfortunately, I don't know much about Mac antivirus, so I'll let someone else suggest good products in that area.
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Tony Fabris