Same thing with me. Some files could not be scanned due to password protection of programs/files. The files that Avast! isn’t able to scan on my PC is SOME Ad-Aware and most PK-Zip Reader files. My Ad-Aware files that couldn’t be scanned are mostly skins --_-- … Yeah, they got customizable skins and such that Avast! can’t scan for some reason, and PK-Zip Reader is just program password protected.

I found this when I strechted out the top to view more text for both the reason (or was it result … ?) and program/file texts. Maybe you need to do that to figure it out yourself OR better yet, post them here for us to examine (I hope copy and paste works with the results page …) ?