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The Event Viewer records five types of events:
Error
A significant problem such as loss of data or loss of functionality is categorized as an Error. For example, if a program or service fails to load during Windows startup, an Error will be logged.
Warning
An event that is not significant but may indicate a possible future problem is categorized as a warning. For example, when the CPU utilization is high or disk space is low, a Warning will be logged.
Information
An event is categorized as information if it describes successful operation of an application, driver, or service. For example, when a device driver loads successfully, an Information event will be logged.
Success Audit
An audited security access attempt that is a success is categorized as a Success Audit. For example, a user's successful attempt to log on the system will be logged as a Success Audit event.
Failure Audit
An audited security access that has failed is categorized as a failure Audit. For example, if a user tries to access a network drive and fails, the attempt will be logged as a Failure Audit event.
