Event Viewer, a component of Microsoft's Windows NT line of operating systems, lets administrators and users view the event logs on a local or remote machine. In Windows Vista, Microsoft overhauled the event system. Due to the event viewer's routine reporting of minor start-up and processing errors (which do not in fact harm or damage the computer), the software is frequently used by technical support scammers to convince users unfamiliar with Event Viewer that their computer contains critical errors requiring immediate technical support.