Microsoft Security Essentials (MSE) is a free anti-virus program for personal computers & provides real-time protection against the virus, spyware & other malicious software.The program that runs at the background while using the Personal Computer & checks the internet daily for any updates. It performs scheduled scans of the computer for any malware, automatically blocking most threats. Basically, if the Microsoft Security Essentials icon is displayed as green in the notification area, at the far right of the taskbar then the computer is in a good condition. If the program detects a problem / threat then it displays a message with the detected item, alert level & the recommended action. You can use Microsoft Security Essentials to perform a manual scan of a file, folder or entire PC at any time.
Microsoft Security Essentials provides real-time protection, constantly observing activities on the computer & scanning new files as they are created / downloaded & disabling detected threats and prompts for user input on how to deal with them. If no response is received, then suspected threats are handled according to the default actions defined in the application’s settings. By those settings, it may also create System Restore checkpoints before removing the detected malware. It lacks the personal firewall of OneCare / the centralized management features of Forefront Endpoint Protection.
As a part of the real-time protection by default, Microsoft Security Essentials reports all suspicious behaviors of monitored programs to Microsoft Active Protection Service / a web-based service.