Microsoft Security Essentials – a popular software from the company Microsoft to protect the system from viruses, spyware, worms and other malware threats. Microsoft Security Essentials conducts scanning of system and notifies user about suspicious changes on your PC or attempt to install a spyware. The software enables to check for malware various portable devices and data carriers. Microsoft Security Essentials also contains a tool that enables to check the latest versions of viruses and spyware before scheduled test.