Avast Free Antivirus
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Full user review
It doesn't slow down the PC;
Auto-Updates really come in handy;
Works really well (I don't think I had a virus, since I've been using Avast!
The quality-price ratio is infinite -- very good quality, zero price!!!
I can't say anything bad about it, even though maybe I'm not very advised in antiviruses..
Anyhow, all I can say, is maybe you should change the voice that let's you know about updates :)
Great quality, great support, great company