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. It runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want.
Download: Microsoft Security Essentials 4.2.0223.0
