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Uninstall PC Tools iAntiVirus for Mac
I uninstalled iAntiVirus by dragging .app file to trash. As it is said here: http://www.pctools.com/kb/article/how-to-uninstall-pc-tools-iantivirus-4...
But there is still the "com.pctools.iantivirus.kfs" in /System/Library/Extensions left.
Is it safe to delete this file? Are there also any other files that need to be removed manually?