AVG AntiVirus Free 2013
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Full user review
"Amazing. Meets all my needs."
I've used AVG Free for several years now and it has been an excellent tool. In my place of business we use Sophos Enterprise Edition, but AVG still detects more viruses/malware than Sophos, despite being free. Along with this, it is very good at cleaning the malware, not just simply reporting it as other software tends to do.
It is slowly becoming more bogged down with bloatware and tricks to attempt users to install toolbars, etc. during installation. If you disable all the junk and install the core features, it's a great tool.
AVG doesn't detect every piece of malware, but no virus scanner ever will. The rate at which malware is written and distributed is extremely rapid, so it would be impossible to keep up 100%. Even so, AVG seems to do a significantly better job than its competitors and you can't beat the price.