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Windows 8 and 10 have built-in anti-virus software known as Windows Defender.
Malware protection
Additionally, individuals may wish to use a supplementary malware scanning technology. ISS has had good luck with Malwarebytes, downloadable from the vendor's site.
Formerly, IST had recommended AVG Free as a non-Microsoft product, but this recommendation is rescinded based on their updated privacy policy.
Mac OS
While Apple builds some anti-malware technology directly into their operating systems, Sophos is also available.
Non-University of Waterloo owned machines
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If your personal PC is running Windows 8.1 or 10, our recommended anti-virus solution is Windows Defender.