Microsoft released the final version 4.0 of Security Essentials. MSE provides real-time protection for your home or small business PC that guards against viruses, spyware, and other malicious software. You can download for Free and must run genuine Windows to install Microsoft Security Essentials. Before installing Microsoft Security Essentials, is recommend that you uninstall other antivirus software already running on your PC. Running more than one antivirus program at the same time can potentially cause conflicts that affect PC performance.
Download Microsoft Security Essentials 4.0