Event Viewer is a component of Windows that lets administrators view event logs on local and remote machines. It maintains logs about program, security, and system events that can be used for troubleshooting. These logs include application logs generated by apps, system logs from installed services, and security logs recording logon attempts and resource access. Event Viewer contains information about errors, warnings, user actions, and login successes or failures. However, scammers may use minor errors in Event Viewer to trick users into thinking their computer has critical problems.