You didn’t say what kind of computer you have so I only gave you programs for PC Windows
1. AVG Anti-Virus Free
Anti-Virus Free from AVG is the best free antivirus software available. AVG Anti-Virus Free is a full-fledged antivirus and antispyware tool, includes an email scanner, link scanner, scheduled scanning options, automatic updates, and more.
2. avast! Free Antivirus
Avast! Free Antivirus has fully functioning antivirus and antispyware engines protecting your PC from threats from the Internet, your files, emails, and even instant messages.
Tip: You are required to register avast! to use it more than 30 days but registration is free and pretty simple.
5. Avira AntiVir Personal
Avira AntiVir Personal protects you from viruses, Trojans, worms, spyware, adware, and various other kinds of malware, making it a fully functional antimalware tool.
The only things I didn’t like about Avira AntiVir Personal was the configuration you have to complete after installation which might be difficult if you’re a computer novice.
6. Panda Cloud Antivirus
What makes Panda Cloud Antivirus one of the best free antivirus programs is that it does its job from “the cloud” meaning the hard antivirus work that typically slows down a computer is done on computers elsewhere on the Internet, freeing up your computer to work like it should and protecting you from malware even better.
You didn’t say what kind of computer you have so I only gave you programs for PC Windows
1. AVG Anti-Virus Free
Anti-Virus Free from AVG is the best free antivirus software available. AVG Anti-Virus Free is a full-fledged antivirus and antispyware tool, includes an email scanner, link scanner, scheduled scanning options, automatic updates, and more.
http://freebies.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=freebies&cdn=hobbies&tm=2&gps=468_563_1276_811&f=00&tt=4&bt=0&bts=0&zu=http%3A//free.avg.com/us-en/download-avg-anti-virus-free
2. avast! Free Antivirus
Avast! Free Antivirus has fully functioning antivirus and antispyware engines protecting your PC from threats from the Internet, your files, emails, and even instant messages.
Tip: You are required to register avast! to use it more than 30 days but registration is free and pretty simple.
http://freebies.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=freebies&cdn=hobbies&tm=4&gps=480_603_1276_811&f=00&tt=4&bt=1&bts=0&zu=http%3A//www.avast.com/free-antivirus-download
3. Microsoft Security Essentials
http://freebies.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=freebies&cdn=hobbies&tm=2&gps=492_568_1276_811&f=00&tt=4&bt=1&bts=0&zu=http%3A//www.microsoft.com/security_essentials/
4. Comodo Antivirus
http://freebies.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=freebies&cdn=hobbies&tm=8&gps=508_424_1276_811&f=00&tt=4&bt=0&bts=0&zu=http%3A//antivirus.comodo.com/
5. Avira AntiVir Personal
Avira AntiVir Personal protects you from viruses, Trojans, worms, spyware, adware, and various other kinds of malware, making it a fully functional antimalware tool.
The only things I didn’t like about Avira AntiVir Personal was the configuration you have to complete after installation which might be difficult if you’re a computer novice.
http://freebies.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=freebies&cdn=hobbies&tm=240&gps=364_484_1276_811&f=00&tt=3&bt=0&bts=0&zu=http%3A//www.free-av.com/en/products/1/avira_antivir_personal__free_antivirus.html
6. Panda Cloud Antivirus
What makes Panda Cloud Antivirus one of the best free antivirus programs is that it does its job from “the cloud” meaning the hard antivirus work that typically slows down a computer is done on computers elsewhere on the Internet, freeing up your computer to work like it should and protecting you from malware even better.
http://freebies.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=freebies&cdn=hobbies&tm=218&gps=511_500_1276_811&f=00&tt=3&bt=0&bts=0&zu=http%3A//www.cloudantivirus.com/en/
7. Immunet Protect FREE
Immunet Protect FREE protects your computer from bots, worms, viruses, Trojans, keyloggers, and spyware.
http://freebies.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=freebies&cdn=hobbies&tm=167&gps=409_460_1276_811&f=00&tt=3&bt=0&bts=0&zu=http%3A//www.immunet.com/
8. digital-defender Antivirus
http://freebies.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=freebies&cdn=hobbies&tm=121&gps=510_610_1276_811&f=00&tt=3&bt=0&bts=0&zu=http%3A//www.digital-defender.com/digital-defender-antivirus-free
9. PC Tools AntiVirus Free
http://www.pctools.com/free-antivirus/