Hello,
I would suggest you to create a Case with Symantec Technical Support.
They would help you with a Resetpass tool for SEP 12.1
To Create a Case OR contact Symantec Technical Support.
How to create a new case in MySupport
http://www.symantec.com/docs/TECH58873
How to update a support case and upload diagnostic files with MySupport
http://www.symantec.com/docs/TECH71023
OR
Regional Support Telephone Numbers:
United States: https://support.broadcom.com (407-357-7600 from outside the United States)
Australia: 1300 365510 (+61 2 8220 7111 from outside Australia)
United Kingdom: +44 (0) 870 606 6000
Additional contact numbers: http://www.symantec.com/business/support/contact_techsupp_static.jsp
Hope that helps!!