How to Clear Event Logs
In Windows, you can clear the event logs by selecting Clear all Events on the Action menu after selecting the appropriate log file. You have the option of saving the event log before you clear it.
To clear event logs
Click Start, and point to Programs.
Point to Administrative Tools, and then click Event Viewer.
Select the appropriate log file (Application, Security, System, Directory Service, or File Replication Service).
Click the Action menu, and then click Clear all Events.
You will be prompted to save the file.
Note
There is no verification for clearing the event log.