can you let me know if it helps
http://www.symantec.com/business/support/index?page=content&id=TECH166658
in case sem5.log is of huge size, you can use the steps to recreate the sem5.log
1) Stop SEPM and database services.
2) Rename / Delete the current log
3) Click Start, click on Run and Type "CMD" then click OK
4) In the Command Prompt type: "CD C:\Program Files\Symantec\Symantec Endpoint Protection Manager\ASA\win32\" and press Enter this will change directories to the folder containing dbsrv11.exe.
5) To force the recreation of sem5.log. Type: "dbsrv11 -f "C:\Program Files\Symantec\Symantec Endpoint Protection Manager\db\sem5.db" and press Enter
6) Click Start, click on Run and Type "services.msc" then click OK and start the Symantec Embedded Database Service
7) Start the Symantec Endpoint Protection Manager service.