Whilst the idea of a free native light weight AV option of OSX sounds like a good idea, iantivirus has too many flaws to make it worthwhile. I recommend that anyone still using it should remove it immediately.
- The 'CPU' issue - a universal problem, repeatedly reported and never fixed where the iavd process takes up 100% CPU power. PCTools shows no interest at all in fixing this.
- The bogus threat list - you include viruses that could only infect Classic systems on PPC machines - some from version 6! You also include 'threats' from older versions of OSX that won't run on intel machines either. If you are going to exclude Windows malware, then you should exclude these for the same reason.
- It acts like malware. On launch it adds itself to your start up items, without warning or request. Any program that wants to load on launch must ask permission first, otherwise it is no better than the 'threats' it tries to protect you against.
You might say 'What is the point of Antivirus' that doesn't load on launch?' Well because it can't be trusted not to try and burn out your CPU it can't be left loaded anyway. The option to open it and run a scan should exist without forcing its way into launch items.

