Hi,
Please update the system with latest anti virus definition and do a full scan of the system and then
Run the Symantec NPE (Nortan power eraser) tool on the system.
Even you can manually remove the same.
Go through the below link..
http://blog.yoocare.com/how-to-get-rid-of-trojan-gen-2-completely-trojan-gen-2-removal-guide/
Removal Tool