Certainly appears to be all archive scanning errors. Unknown passwords will do that; avast! cannot open these files to scan them and is simply reporting that fact as only a scanning error.

Archived files are inert and cannot do harm to your system unless they are opened by you and also contain malicious files within them. If not ever opened, they cannot be malicious even with known malware within; avast! will alert and block any malicious files detected inside an archived file the moment they are opened manually by you, however. avast! will automatically scan the opened archive file as it is being uncompressed from its compressed state.

A part of the .jpeg is not viewable. Could you attach a second picture showing the rest of the detection lines by sliding the bar to the right?

[EDIT:]

http://forum.avast.com/index.php?topic=147725.msg1072754#msg1072754 Thank you Pondus, for this link.