HijackThis is an application for detecting and removing a variety of malware (mainly malware and adware) from the system. HijackThis explores the system registry and identifies potentially malicious entries in it. The user only has to remove them.
Goes through the entirety of a PC and the registry of the system to detect computer viruses and malware and quarantine and remove threats to your computer. Effective antivirus but you will have to do the removal, it merely identifies the threats for you to take action.