How to Change Event Viewer Settings
In Windows, you can adjust Event Viewer settings by right-clicking the log and clicking Properties.
You can adjust the following Event Log settings:
Maximum log size
Overwrite events as needed
Overwrite events older than x days
Do not overwrite events (Clear log manually)
Using a low-speed connection (Windows)
To change Event Viewer settings
Click Start, and point to Programs.
Point to Administrative Tools, and then click Event Viewer.
Right-click the appropriate log file (Application,Security,System,Directory Service, orFile Replication Service).
Click Properties.