HiJackThis is a sophisticated security tool that checks a computer running Windows 2000 or higher for possible signs of hijacked applications. It does check lots of different elements like startup items, Browser Helper Objects, running processes and the like and presents a log of the results at the end. This log is hard to read for beginners because it contains “good” and possible “bad” elements in it and it requires knowledge of those elements to make a distinction between elements that you have to keep and those that are indeed malicious in nature.