Hello,
In such cases, To reset the administrator password
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Open Windows Explorer on the computer that runs Symantec Endpoint Protection Manager.
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Locate the <Drive>:\Program Files\Symantec\Symantec Endpoint Protection Manager\Tools folder.
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Double-click the resetpass.bat executable file.
The password is reset to admin.
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Change the password immediately.
Reference: http://www.symantec.com/docs/HOWTO26949
NOTE: Make sure you do not use wrong password for more than 5 times or else the account would get locked for 15 minutes.
In that case, the only way to get that unlocked is either to wait for 15-20 minutes or reset the Clock to 30 minutes ahead the actual time.