Annfromnew bern wrote: I am trying to install avast on my imac. When I click on download, a site comes up that is called clean my mac. Has anybody installed avast, the free version? I installed Avast 'free antivirus' version 2014.9.0.2006 on a brand new Mac containing nothing other than one minimally configured User account. It found hundreds of problems including 'decompression bombs' corrupted archives, 'too big to be processed' and 'unknown errors'. It also caused intermittent system unresponsiveness, and a popular benchmarking app (a crude but quantitative tool) recorded a 10% reduction in overall system performance.

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Like most 'anti-virus' programs, it's junk. Don't bother with such garbage. Let your Mac work as it was designed to work, without burdening it with worthless trash. The advertisement for 'CleanMyMac' should be dismissed with extreme prejudice, as should all such ads. Do not install any program claiming to 'clean' your Mac unless you want real problems. They are all scams with one and only one purpose - to take your money, which is the only thing they do well.

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OS X already includes everything it needs to protect itself from viruses and malware. Keep it that way with software updates from Apple. To use your Mac properly, just use your head.

Follow these few simple principles, most of which are equally applicable to any computing platform: • Never install any product that claims to 'speed up', 'clean up', 'optimize', or 'accelerate' your Mac. Without exception, they will do the opposite. • Never install pirated or 'cracked' software, software obtained from dubious websites, or other questionable sources. Illegally obtained software is almost certain to contain malware. • Don’t supply your password in response to a popup window requesting it, unless you know what it is and the reason your credentials are required. • Don’t open email attachments from email addresses that you do not recognize, or click links contained in an email: • Most of these are scams that direct you to fraudulent sites that attempt to convince you to disclose personal information.

• Such 'phishing' attempts are the 21st century equivalent of a social exploit that has existed since the dawn of civilization. Don’t fall for it. • Apple will never ask you to reveal personal information in an email. If you receive an unexpected email from Apple saying your account will be closed unless you take immediate action, just ignore it.