Virus found pop up will not stop

I have a pop up from mail sheild that keeps popping back up no matter what I select. I have tried fix automatically, delete, ignore, everything and as soon as I click “OK” another pops up. It did change from NSIS to Trojan but I can’t believe I got this many bad emails. Thanks in advance for any help.

Oh I even opened the program and changed the way it should handle the to no avail.

http://forum.avast.com/index.php?topic=53253.0

And eh… NSIS = Nullsoft Scriptable Install System