i thank everybody who has given their support for me to solve my issue.
I would like to close this post by adding the steps which i had done for solving this issue.
1. i started symantec embedded services from services.msc , it starts and stops automatically with an error telling " Symantec Embedded Database cannot be started "
2. Then i go to the path where the sem5.db file is located "C:\Program Files (x86)\Symantec\Symantec Endpoint Protection Manager\db" then i deleted the sem5.log file .
3. Then i created the new sem5.log file using this command in cmd prompt " dbsrv12 -f "C:\Program Files (x86)\Symantec\Symantec Endpoint Protection Manager\ASA\win32"
4. Now i gone to "C:\Program Files (x86)\Symantec\Symantec Endpoint Protection Manager\db " location and one new sem5.log file has been created.
5. now i restarted the server
6. after restarted i started the symantec embedded service , then i tried login sepm console with the username and password.
7. the problem is solved .