Hi
Please Follow the steps Below:
1. Go to C:ProgframFiles--Symantec--SymantecEndpointr ProtectionManager--Tools--Resetpass.bat
2.Stop all the symantec services
3.Run the resetpass.bat.
4.Restart the symantec services.
5.Login to manager with username--Admin and Password--admin.
6 Reset the new password
Hope this will resolve ur issue.
Ajit