Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
AnalyzeIE is a trojan that changes the browser settings such as default startpage of Internet Explorer. It usually comes into user computer by exploiting browser vulnerabilities. It is also capable of downloading and executing other components.