Choosing the right antivirus software can add important online security for your computer and network devices. Without antivirus software, your vital passwords and personal information could be up for grabs by hackers and malware -- a big reason why identity theft is an increasingly common problem. Deciding on which antivirus protection to use can be overwhelming, especially considering the sheer number of free and paid options. What makes each of the leading antivirus software packages stand out? We'll attempt to answer that question here by reviewing each of the top-rated anti-virus software options.