Need help, "Infection: Win32:Filename-A [Susp]"

I get the following message one after another, non-stop. Avast scan shows nothing but these messages continue on and on. How do I remove the cause of these message? I tried rebooting and no help. They start back up again and go on and on.

avast!Mail Sheild has blocked a threat.
No futuher action is required.
Object: Outgoing email ‘documents and passport …’ and others
Infection: Win32:Filename-A [Susp]
Action: Deleted
Process: C:\Window/SysWOW64\shchost.exe
The threat was detected and blocked while sneding or receiving an email.
Thanks,
Pam

follow instruction and attach logs (not copy and paste) http://forum.avast.com/index.php?board=4.0

we need logs from Malwarebytes / OTL / aswMBR