Call support get cleanwipe tool, run the tool, reboot the system , install the latest version
You could also Create a case with with Symantec Technical Support Team. Check this Article below:
How to create a new case in MySupport
http://www.symantec.com/docs/TECH58873
Phone numbers to contact Symantec Technical Support:-
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