Microsoft Security Essentials is one of the best free Antivirus and Anti malware solution available today. I have been personally using MSE for a while now and have found it to be the best security solution which is easy on system resources and does its job well.
Today, Microsoft released a new version of Microsoft Security Essentials for beta testing. Some of the new features in Microsoft Security Essentials Beta include:
Windows Firewall integration During setup, Microsoft Security Essentials will now ask if you would like to turn the Windows Firewall on or off.
Enhanced protection for web-based threats Microsoft Security Essentials now integrates with Internet Explorer to provide protection against web-based threats.
New protection engine The updated anti-malware engine offers enhanced detection and cleanup capabilities with better performance.
Network inspection system Protection against network-based exploits is now built in to Microsoft Security Essentials.
You will need to sign in to Microsoft Connect in order to download the latest beta of Microsoft Security Essentials. To download MSE beta, head over to this link. MSE beta is available in both 32bit and 64bit editions and also supports Windows 7. More info and details on MSE Beta can be found at the Windows Team Blog.