My iMac came up in safe mode after taking a long time to boot. Should I worry?

When I rebooted, there was a line running across the middle of the screen indicating that something was installing or happening.  Then the computer came up in safe mode and required me to log in, which I never have to do.  I run Kapersky anti virus as a precaution and don't think I saw the icon in the bar just before I rebooted. So I am not sure it something shut it down or not.  I rebooted, started the anti virus and am doing a scan now.  But should I be concerned? I have never had a safe mode issue with my Mac. The scan finished and found nothing and the computer seems to be running ok. Last night it did seem a little slow. Was there an operating system or iTunes update that came through during the night and was installing this morning? That wouldn't explain safe mode. Any help would be appreciated.

Unfortunately most antivirus software on Mac's tend to create more problems than they solve. Many people that switch from PC's install them from habits gained while they used PC's. There are also those that use them to protect people that have PC's that they send files to. Because  there are no virus's for Mac's the only reason to use any type of antivirus software is either paranoia or fear of passing on a virus or other malware. Many people on these forums don't use any antivirus application and have been doing so for years with no ill effects, some will use a tool called ClamXav that isn't intrusive and works well on Macs. My suggestion is to uninstall the Kapersky software using Kapersky's uninstall instructions. Then if you have to have antivirus software use ClamXav (it's free) download and install it or if you don't share data with PC users to not run any antivirus software at all. I suspect once done you will gain lost performance and your computer will return to being stable again.
Roger

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