Avast Free Antivirus
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Full user review
"Great software, highly recommended."
As a master with computer security, this software is one of the best. High detection ratios (though not as high as Avira, but there is only a little difference), the most advanced protection out of any other free AV out there, and straight forward settings to use. I recommend this as #1 of free or paid AV to use.
Its trojan detection is kinda lower then anythign else it detects, but it sill detects a great number.
I still debate between this and Avira, but i have been using Avast since 4.0 and I am still pleased with it. For all of those who are getting those annoying pop ups, there is an option to disable them in the settings on the tab bar. If you somehow still experience this, which you shouldn't otherwise you didnt disable it, then you can change the durations to 0 or 1 so you don't see them.