- Microsoft Security Essentials: Free antivirus program from Microsoft, tightly integrated into Windows, and has excellent detection capabilities
- Windows Defender: Free antispyware application from Microsoft. Recommended if you use Windows XP or lower, already included in Windows Vista & Windows 7
- AVG Free: A robust, free antivirus package from Grisoft, one of the first popular free antimalware programs. AVG Free has come under fire lately for letting some malware fall through the cracks
- Avast! Home Edition: Free antivirus software that is lightweight and has good detection capabilities, although some have complained about the awkward user interface
- Sophos Anti-Virus for Mac Home Edition: Free antivirus software for Mac OS X.