[Description] This value is of type REG_DWORD. The default value is 0. If this value is 0, the records of events are always overwritten. If this value is 0xFFFFFFFF or any nonzero value, records are never overwritten. When the log file reaches its maximum size, you must clear the log manually; otherwise, new events are discarded. You must also clear the log before you can change its size. Windows Server 2003 and Windows XP/2000: This value is the time interval, in seconds, that records of events are protected from being overwritten. When the age of an event reaches or exceeds this value, it can be overwritten. [Registry value] 
Retention