Trojan.Mirai is a harmful trojan malware affecting various Windows operating systems, detected on 10-02-2017, causing slow internet connections, system crashes, and unwanted pop-ups. Two removal methods are available: a manual process involving control panel uninstallation and registry cleaning, and an automatic method using recommended security software SpyHunter. The document outlines the steps for both methods to effectively eliminate the trojan from infected PCs.