Avast Free Antivirus
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Full user review
"The best reliable free antivirus."
Its free and the safest free antivirus. Unlike most antivirus in the market it doesn't count false positives and even if it does you can report it to the avast community. It come not only with an antivirus; the new version has a new feature which most anti-viruses don't have, its called software updater. I've been using it for a while, its fun and cool. The web shield, peer to peer, mail shield, network shield, script shield, file system shield and behavior shield works great. It doesn't slow your computer.
It is not so great on a Mac or any UNIX based computer. I've used it on my Windows 8 laptop and it was not working fine, so I had to remove it.
If your using it at your home or on your laptop or even on you android tab or phone its the best free anti-virus option you have. If wanna an virus protection software for an office try the Pro or Internet Security version. I've been using avast for over 4 years and its so perfect for me.