Digital Home Thoughts: What Anti-Virus Software Causes The Least Harm?

"The solution to all this is to not be caught with your virtual pants around your ankles, and lucky for us, antivirus vendors have stepped up their game with increasingly robust all-in-one security suites. In fact, unlike other technology categories, the field of AV continues to expand rather than consolidate, with an overwhelming number of apps promising protection and unique features."

Regardless of what software package you choose, I honestly think that anti-virus software, and in general, Internet security software, is a necessary evil. I would like to think that I am pretty savvy. I am fairly diligent about updating my software, what websites I visit and keep abreast of the various scams out there. However, I am not arrogant enough to think that I am impervious to all the threats out there. I can only protect against what I do know, and admittedly, that is only so much. So I have a fail safe in running anti-viral software on all my computers. It is no guarantee, but it helps, just in case I come home drunk one night and decide to cruise the darker parts of the web. All that being said, my current favorite is Microsoft Security Essentials. What is yours?