Microsoft Security Essentials
is an effective antivirus program that provides real-time security. The software's main function is to protect your computer against existing malware, viruses, and spyware. Microsoft Security Essentials is able to not only detect malicious software that is trying to infiltrate your data, but also block them by activating or increasing the firewall mode (while connected to the internet). The software is programmable to run scans at set intervals, including monthly and annually.