Hello,
You could submit the file to Symantec Security Response by submitting on :
https://submit.symantec.com/websubmit/essential.cgi
Could you try Running the Scan in Safe mode with Networking and check if that helps.
Secondly, you could try running the SERT utility as well:
Check this Articles:
How to make the Symantec Endpoint Recovery Tool boot from a USB memory stick
http://www.symantec.com/docs/TECH131578
How To Use the Symantec Endpoint Recovery Tool with the Latest Virus Definitions
http://www.symantec.com/docs/TECH131732
Symantec Endpoint Recovery Tool (SERT) download comes as an ISO (disk image). How do I use this?
http://www.symantec.com/docs/TECH131685
What does the full scan from the Symantec Endpoint Recovery Tool (SERT) CD scan ?
http://www.symantec.com/docs/TECH150491
Hope that helps!!