Although free software has its limits, AVG Antivirus and ZoneAlarm are among the best programs out there to protect and maintain your PC. If you are looking for an economical plan, these are for you, as they cost nothing. If you are looking for professional software to protect your computer, I recommend Norton Antivirus Pro and ZoneAlarm Pro. These come with added features and security.
MUST HAVES
This is probably the best free antivirus software out there. A user-friendly program that is very easy to understand and updates automatically.
This free firewall will keep you protected from internet threats and hackers. Easy setup with a user-friendly interface.