World Cup 2014 begins on Thursday, June 12.
Widely praised as the best malware removal and prevention tool, it normally sells for around $50.
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Facebook helps users get their malware infected computers cleaned up.
The donationware ClamXav and the free Sophos Anti-Virus for Mac combine real-time protection, automatic updates, and on-demand malware scanners to help prevent infections.
The social network says its blacklist has also been augmented by the security firms, which have offered up their own URL blacklist databases.
A variety of free antivirus apps for Android devices proved unreliable, according to a recent test conducted by AV-Test.
Two companies complain about antitrust and other issues with Microsoft's plan, but several analysts argue that Redmond isn't bundling and any protection is better than none.
Sophos antivirus for Mac is free and detects malware targeting Mac and Windows systems.
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When you want to make a one-time scan, here's how to do it on the Web.