Best Free Antivirus 2010 – Microsoft Security EssentialsA Few Words about Microsoft Security Essentials – The Real Effective PC Security ToolSecurity Essentials is one of the few
Free products from software giant Microsoft, which is really worth its weight in gold. It 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. It’s easy to tell if your PC is secure — when you’re green, you’re good. It’s that simple.
Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want—without interruptions or long computer wait times.
Great, But I wanna Know which is the Best Free PC Security ToolSo here we take the opportunity to present the results of the rigorous testing performed by the independent research team at
AV Comparatives.The test was performed on about 20 popular PC Security suites, which were updated with their signature database available upto 10th February 2010. Then they were exposed to the malware and online threats, which were detected after that. The purpose was to test, whether they are able to detect an online threat based on their heuristic and other analytical powers even if the signatures are not present in their database. This forms the basis of their power and efficacy to detect the new threats.
The Results – Which is the Best Free AntivirusThe test result show that
TrustPort 2010 was rated highest for detecting the new malware. However, when we talk about the Free software, Microsoft Security Essentials was the leader.
See the test results in the screenshot below.

You can read the complete report on the site
http://www.av-comparatives.org (pdf). Some interesting observations are available there to read.