Hi,
please send the file Details.zip in folder
C:\Documents and Settings\Administrator\Local Settings\Application Data\IM\Identities\{1061A869-3985-4C6D-BD9F-84230187524C}\Message Store\Attachments\ATT19.eml
to virus@avast.com
or send file ATT19.eml in folder
C:\Documents and Settings\Administrator\Local Settings\Application Data\IM\Identities\{1061A869-3985-4C6D-BD9F-84230187524C}\Message Store\Attachments\
to avast
then delete the file(s) manually, or delete the offending Email from within your Incredimail-programm;
pause avast shield for this, and be sure to empty the IM-Trash & COMPACT all mail folders in IM