You can reset it with forgot password from console
https://www-secure.symantec.com/connect/articles/how-reset-symantec-endpoint-protection-manager-console-password-sep-121
Edit
For the resettool.bat file
https://www-secure.symantec.com/connect/downloads/how-reset-sepm-password-121x
Resetting a forgotten password
http://www.symantec.com/docs/HOWTO55059
Resetting the administrator user name and password to admin
http://www.symantec.com/docs/HOWTO54992
Check the thread
https://www-secure.symantec.com/connect/forums/password-reset-2