Always keep your operating system up-to-date.
Windows 10 includes built-in anti-virus protection called Windows Defender.
Anti-virus for Windows for personal PCs (Windows 8, 7, Vista):
Microsoft Security Essentials https://windows.microsoft.com/en-US/windows/products/security-essentials
Anti-virus for Mac (or an alternative for Windows):
Sophos Home https://home.sophos.com/
Anti-malware for Windows and Mac:
Anti-virus for Windows on University-owned PCs:
Microsoft System Center Endpoint Protection License required. This software is installed and supported by BIOTA IT staff. To get it, contact us at firstname.lastname@example.org