The type of anti-virus you use on your computer is greatly dependent on your needs and how you use your computer. There are a myriad of options when it comes to protecting your computer and information. It is recommended you do your research to determine what best fits your needs. Below are a couple of free options for you to investigate further.
Windows Defender is built into Windows and is totally free. Be sure to keep Windows up to date to take full advantage of Windows Defender.
Malwarebytes offers strong antivirus tools as a free download version. This is a great on demand option and one that we use at TCT during PC repair.