Best you can do is run the threat analysis scan from the symhelp tool and submit any findings to symantec. Also try running a tool called adwcleaner and junkware removal tool
How to run the Threat Analysis Scan in Symantec Help (SymHelp)
http://www.symantec.com/docs/TECH215519
Security Response recommendations for Symantec Endpoint Protection 12.1 settings
http://www.symantec.com/docs/TECH173752
Security Best Practice Recommendations
http://www.symantec.com/docs/TECH91705