Hi,
Basically Symantec provides Power eraser and SERT tool to scan infected machine if SEP is not working
Power Eraser
Download Sep support tool & scan the affected system with power eraser.
Power eraser user guide.
http://www.symantec.com/theme.jsp?themeid=spe-user...
Here is the location of the Symantec Endpoint Protection Support Tool:
http://www.symantec.com/business/support/index?pag...
OR
Symantec Endpoint Recovery Tool
What does the full scan from the Symantec Endpoint Recovery Tool (SERT) CD scan ?
http://www.symantec.com/docs/TECH150491
OR
Online scan for virus and threat
http://security.symantec.com/sscv6/home.asp?langid=ie&venid=sym&plfid=23&pkj=UQFPFIZTYMWPAZTJWUF
Manually delete Trojan
https://www-secure.symantec.com/connect/forums/trojan
Best practices for responding to active threats on a network
http://www.symantec.com/docs/TECH122466