Malwarebytes, as the name implies, is a program for detecting and cleaning all manner of malware (software designed for malicious purposes). Its free version is for personal use, and provides on-demand scanning and removal of a variety of threats. Only the paid version includes real-time monitoring and detection, though, so it is a good idea to use a more specific anti-virus program as well.
Malwarebytes products have a proven record of protecting computers by completely removing all forms of malware, including viruses, Trojans, spyware, adware and rootkits. When it comes to the safety of your computer, Malwarebytes provides the ultimate in protection from the cutting edge of technology!