Norton internet security 2012 can not detect - Trojan Bagle

Dear Team,

My computer used "windows 7, office 2010 and  norton internet security 2012" everything is full license and newest update.

- So someday - The computer effect virut "Trojan Bagle". The email in microsoft oulook automatic send one email to all user in list contact with subject: New_price.... and one file attach "New_price.....zip"

 

- i'm scan full with norton internet security 2012 but don't find anything.

 

please help me how to remove this trojan

 

 

Thanks

Hung