Here are the Some of Free Useful Antivirus Software for people to keep their Windows 7 system safe from any viruses.
Avast antivirus software is available for free and commercial use. It provides complete virus protection for your computer. Antivirus engine is complemented by anti-spyware, firewall and ant spam modules to protect you against phishing schemes, identity theft and internet-distributed web viruses. Automatic updates for greater user convenience and safety.
AVG has been around in the Antivirus market from ages and gained lot of loyal users to their kitty. They also provide upgraded version which is very costly but I believe that their free Antivirus program is great for users having personal computers. AVG user interface is pretty simple and it takes a minute to install on your computer.
Microsoft Security Essentials provides real-time protection for your home 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 always kept up to date so you can be assured your PC is protected by the latest technology.
The first free cloud antivirus against viruses, spyware, rootkits and adware. Panda Antivirus Beta3 supports Windows 7 (32 and 64bit).The antivirus carries out Background Scan by deactivating many unnecessary operations.
One of the simple to use and light Antivirus software in the market. It works perfectly fine to detect virus, spyware, rootkit threats. The best part of Avira is that it is quiet outstanding in terms of finding malware. Few false positives about Avira is that it does not inlude E-mail scanner in free version, but if you open any infected E-mail, it comes again into action.