Looking for free good anti virus

I'm cleaning a computer that has no anti virus program what is a good free one to install on the computer?
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Avast is my AV of choice.  It has very little impact to system boot time and performance, and yet is reliable at catching viruses.


And of course, avast has a free version, which works very well.
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ThreatFire continually protects your PC against attacks by detecting malicious behavior, such as capturing your keystrokes or stealing your data, instead of only looking for known threats like normal antivirus software. By implementing sophisticated real-time behavioral analysis ThreatFire is able to stop never- before-seen "zero-day" threats solely by detecting their malicious activity.

something especially those freebies are lacking...
I had very good luck with avira, the only bad part they post a banner trying to sell you their product every time it updates.  If  you don't mind clicking ok, then avira is pretty good as well.
I prefer Panda's free version of it's Cloud Antivirus, as it is needs very low resources, and since it does most of the work "in the Cloud" it is also as up to date as possible.

But for your situation, when you are cleaning an infected system, it is better to first use online scanners like Trendmicro's housecall, and then probably run a couple of scans with malwarebytes. Once the system is clean install the cloud antivirus.




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