You can manually clear all of the events from an Event log when necessary. On heavily used servers, it is a good idea to save data from the Event log for later administrative use before you clear all of the events.
To clear Event logs:
Click Start, point to Programs, point to Administrative Tools, and then click Event Viewer.
In the console tree, right-click the appropriate log file, and then click Clear all Events.
You are prompted for whether you want to save the log to a file before clearing it.
Click Yes to save a log and clear all events. If you click No, the log is not saved, but all events are cleared from the selected Event log. If you click Cancel, the request to clear the log is canceled.
