Sophos Antivirus software is available for free on Mac Home Edition. It's features include full protection from viruses, Trojans, and worms; option to add threats to Quarantine; and easy maintenance.
AVG Antivirus, kaspersky, McAfee, Symantec Norton Antivirus, Microsoft Security, Essentials, Sophos, F-Prot, Avast!
There are many anti-virus services to choose from but the one that worked best for my Mac is https ://yazing .com/deals/lifelock/joshualucas (just remove the spaces, it's an affiliate link but it's a great deal with coupon codes)
There are some viruses that can affect antivirus programs by closing them and even deleting important files, preventing them from running. You can still disinfect the computer and then reinstall your antivirus. A utility like Sophos Anti-Virus can be used for this. Sophos provides steps for using this tool here: http://www.sophos.com/support/knowledgebase/article/13251.html
Comodo Antivirus is a free antivirus software that allows users some level of customizability. In terms of price it cannot be beat and it also provides a decent level of protection for computers.
There are free antivirus software you can download online. Some of them have trial dates, so better research first before using the software..
If you're unable to run antivirus software or you don't have any (quite possibly because malware infected your system before you ever tried to install any), there are some utilities which you can use to disinfect your system anyway. Most malware can be effectively detected and removed using Sophos Anti-Virus. The command-line version is available for you to use for free and is useful if, for example, your computer is badly infected and you do not have an antivirus installed or your antivirus installation is damaged. To download and run Sophos Anti-Virus, follow the instructions Sophos provides on this page: http://www.sophos.com/support/knowledgebase/article/13251.html Once you've disinfected the computer, if you don't already have one installed and running, you should download and install an antivirus program. The best free antivirus is Avira AntiVir, which you can download here: http://www.avira.com/en/pages/index.php
There are free antivirus software you can download online. Some of them have trial dates, so better research first before using the software..
Simply download the installer for the antivirus, then run it. With some antivirus software you don't even need to install it!
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The abbreviation "pkr" and other variations on it like "pk" are sometimes used as short for "packer", especially by antivirus software and companies. Packers are programs that compress programs to be smaller, basically speaking, and also can make them more difficult to detect. Few legitimate programs are packed, so some antivirus programs (like Sophos Anti-Virus) include a special detection for programs that have been packed or encrypted (Sophos detects them as Mal/EncPk). While this doesn't necessarily mean the program is a threat, you shouldn't open it unless you know what it is and trust its source.
Some programs aimed to increase perfomance of computers are not compatible with antivirus software.
There are several places where someone can review ratings for popular antivirus software. Some options are Techradar, Anti Virus Software Review and Tech Support Alert.