Avira Free Antivirus
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Full user review
"Best free AV (for me)."
Everything (anti-virus/spyware/rootkit/unknown-vira, browser protection).
Highly customizeable protection settings.
Doesn't slow down my system.
Windows security center detects it as being off until the update process begins even if the realtime is on.
When it finds something, it recommends to run a boottime scan using Avira rescue system which has to be downloaded seperately (it should already be in the av).
This is the av that goes: "THIS IS SPARTA!!!"