Avast Antivirus
Avast Free Antivirus is a well-rounded free antivirus package: It does a solid job at blocking malware, has a pleasant interface, and scans files quickly. It provides the advanced firewall that automatically prevent hacker attack. Avast internet security provides the effective solution against spam(er).
Avira Antivirus
Avira antivirus did a great job and currently doing a great job to protect the user's from viruses and worms, it can fight against Internet spammers and against adware(s), so overall it is a good solution to use.
Comodo Internet Security
Comodo Internet security provides a wonderful features to scan and destroy the known threat for your PC health, beside antivirus solution it provides a firewall solution to protect your computer from hackers. Comodo give a feature to analyse the incoming and outgoing packets from your computer, a effective firewall.
Panda Cloud Antivirus
Panda security provides a range of different tools to protect a computer, panda cloud antivirus is easy to use and a powerfull antivirus solution for the premises,
Microsoft Security Essentials
Microsoft Security Essentials provides real-time protection for your home or small business PC that guards against viruses, spyware, and other malicious software.
Microsoft Security Essentials is a free download from Microsoft that is simple to install, easy to use, and is automatically updated to protect your PC with the latest technology.