Looks like a program protecting its installation file/s, though can’t be certain but it could be adobe reader 9 and adobe have recently taken the precaution of password protecting its files.

The other ones not related to install_reader9 I can’t see the file name .…\ because of this concatenation, but they appear to be a similar reason of programs protecting their intellectual property.

So I believe the reason for not being able to scan them (archive password protected) appears to be reasonable/legit/valid.