The free antivirus programs listed on this page allow you to detect computer viruses, remove or repair infected files, prevent infection, detect and remove email viruses, etc. There are also free online virus scanning services available for those who prefer (or need to) scan for virus that way. Note that a number of the free antivirus software listed have limited support for scanning spyware and other types of non-virus malware that their commercial equivalents provide. If you are looking for commercial antivirus software, the ones that come highly recommended by security-conscious people are Avira Antivir Premium (very light on resources), Kaspersky Anti-Virus and ESET NOD32 Antivirus (also light on resources). Popular among average computer users is Symantec's Norton 360, a version of their antivirus program that includes a firewall, automatic backup and restore program and general all-round protection. If your system is already infected, you may also want to take a look at the Free Antivirus Rescue CDs and DVDs page.