Antivirus FREE comparison

Hello,
Which is the best free antivirus software today? I currently use AVG and I see it is very good for personal use.
I agree that AVG is the best. I am so pleased with it that I have not looked for another free one. Currently though, I am using Kaspersky, it's a paid anti-virus software, but it's very effective.
I believe Avast antivirus is the best free antivirus software ever, it has never let me down for a single day for the past 5 years or so I have been using it. I used it with XP, VISTA, Windows 7, and now that I am planning on using windows 8, I will still use it. You should give it a try.