Avast gives two kind of results for its analysis. Threats and Warnings. Threats is your typical file that can be considered malware. Warnings are files that Avast could not, for whatever reason, scanned properly. In your case they are password protected so Avast could not open them and see what was inside them. Nothing to be concerned about it.

It is always better to attach an image of Avast ( screenshot/screen capture ). Be it a error, alert, scan result, or whatever is in the Virus Chest by opening “Attachments and other options”. See image

How to make a screenshot: http://www.wikihow.com/Take-a-Screenshot-in-Microsoft-Windows