Hi
Please download norton power eraser from the link below
https://security.symantec.com/nbrt/npe.aspx
Please connect the PC online and opne Norton Power eraser and run "Scan for risk" and also go to advanced->system scan.
If the infection still presists
Then run Symantec Endpoint Recovery Tool (SERT)
http://www.symantec.com/docs/TECH131685
For which you will require a PIN you have to contact support for that
Create an Case with Technical Support. They will provide you the Serial Number for SERT Tool.
Followers of this thread may be interested in a new white paper on how to customize SERT. The steps it contains are powerful, though unsupported.
How to Customize Symantec Endpoint Recovery Tool (3rd Party Utility Integration)
https://www-secure.symantec.com/connect/articles/how-customize-symantec-endpoint-recovery-tool-3rd-party-utility-integration
To create a Case OR call Symantec Technical Support, check below:
How to create a new case in MySupport
http://www.symantec.com/docs/TECH58873
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!!