That could be due to the configuration of your SEP/SEPM.  You could run PowerEraser if you want to remove them

http://www.symantec.com/theme.jsp?themeid=spe-user-guide

This doesnt use your configuration and you get the option to delete.  This can be more aggressive than the normal SEP scanning engine so taking a backup of your critical files is recommended.

Please mark posts as solutions if they solve your problem!

Hello,

Trojan.Zeroaccess is a Trojan horse that uses an advanced rootkit to hide itself. It can also create a hidden file system, downloads more malware, and opens a back door on the compromised computer. 

Check the Removal Tool on the link below:

http://www.symantec.com/security_response/writeup.jsp?docid=2011-071314-0410-99&tabid=3

I would suggest you to check this Article:

Using Symantec Support Tool, how do we Collect the Suspicious Files and Submit the same to Symantec Security Response Team.

and submit the Suspicious Files to the Symantec Security Response Team.

and Check these Threads:

https://www-secure.symantec.com/connect/forums/how-stop-trojangen2-coming-my-computer

https://www-secure.symantec.com/connect/forums/how-stop-antivirus-repeatedly-detecting-same-threat

Secondly, Did you try running the SERT utility to remove this threat?

http://www.symantec.com/docs/TECH131732

Hope that helps!!

Hi AGarst,

There are a few threats that SEP's built-in engines cannot remediate.  SEP will still raise a warning flag when it encounters them, prompting the admin to take action.  If a full system scan in safe mode does not succeed, run the Removal Tool that Mithun has linked: that should successfully remove the threat.

Please do keep this thread up-to-date with your progress!  &: )