What's the safest way to reload system software

What's the safest method to reload system software on an intel iMac? My wife's iMac has been behaving erratically.  I have run hardware and virus scans and found no issues. Virus software is Saphos and up to date. Problems began after a brief (5 second) power failure in the neighborhood. My Mac Pro seems fine. Both were on and connected to the internet at the time. I've run a full backup on the iMac so all important files are protected. What next?

Also, your system may have been slow because you installed antivirus software.
DO NOT reinstall Sophos Antivirus.
OS X has it's own built-in software tools to help in detecting or blocking of potential malware.
Some anti-virus solutions can slow down your Mac, but to be honest, the best anit-virus is you, the user and your brain.
Don't visit questionable websites or website you are unsure about.
Don't install pirated software or software downloaded from a questionable or unknown websites or sources.
Java is a vulnerability right now, if you do not need it, don't use it.
Use a browser filter and pop-up blocker
Don't open email attachments from email addresses that you do not recognize.
Install security updates when they become available
Educate yourself as to what threats are common and active.
In effect, use your brain as the AV filter.
Follow that advice and in MOST cases, you will be fine and won't feel the need to have to install antivirus software.

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