Hi,
Within the past hour, I have had 5 Inno Setup Installers go to the chest. IDed each time as Trojen Other. 3 of those installers are repacked and the contents are clean. They are recent repacks so Inno Setup 5.1.11 would have been used. I have Inno Setup 5.1.12 installed now and compiling the setups does not upset Avast nor scan by right click.
Please look into this and if my help is needed then just ask.
Avast version: 4.7.986
Virus database: 000738-0 03/05/07
Operating System: Vista 32bit