Your Welcome,
MBAM is also a good on demand scanner so with Avast! its look really great so have a happy fighting.
Dont be shy to send some undetected malware to Avast! by open the chest and Add the files and Email To ALWIL Software.
If you are running the Windows XP i would recommand to get a two ways firewall like Comodo,Online Armor,PC Tools,Zone Alarm,Outpost Free..... So if you are running Vista then no need to install these firewall i did say because Windows Vista Firewall is 2 ways.
Also Avast! detection rate is now at 98,7 % on Malware Tests.
By the way can you do what mkis is saying for prevent some other user to be infected by this file.
Thank for this reply you have did.
Have a nice day.
Mr.Agent