1. Avast! Free Antivirus:
This is one of the best free anti-virus I ever used. It comes with an easy to use interface that provides access to all its tools. The powerful antivirus and anti-spyware engine provides reliable protection to your PC. It also features real time anti-rootkit protection,sandbox and an easy-to-use remote assistance tool. It uses less sandbox and an easy-to-use remote assistance tool. It uses lesser system resources than other anti-virus.
2. Free AVG Anti-Virus:
AVG Anti-Virus is one of the popular free anti-virus and anti spyware software that features email scanner, link scanner, scheduled scanning options, built-in system resource manager,rootkit detection & removal tool,e-mail and identity protection,registry & disk scanner and more. The new versions includes Windows 8 interface.
3. Avira Free Antivirus 2013:
Avira Free Antivirus is another powerful free antivirus that protects your computer from viruses, Trojans, worms, spyware, adware, and various kind of malware. It comes with an user-friendly interface and provides best malware protection to your PC. It also compatible with Linux and Mac.
4. Panda Cloud Antivirus:
Panda Cloud Antivirus is one of the fastest anti-virus that protects your computer against Trojan horses, adware, spyware and various malware. The “Autorun & USB Vaccination” feature prevents external drives to run automatically when connected. It uses less amount of system resources and provides significantly better detection rate.
5. Microsoft Security Essentials:
Microsoft Security Essentials is one of the easy to use antivirus. It offers comprehensive malware protection and rootkits detection tools.It is a good choice for average users,as it automtically updates and removes threats. It uses less amount of system resources and silently does its job without any user notification.
You can choose any anti-virus for your computer according to your need.