What KIND of files are causing a problem?
If they are MOV files, what version of Quicktime do you have installed?
They are .prproj files which is what I thought premiere used
What version or Premiere Pro are you using and what version was the file designed to be used by? Are they the same or different?
They are both brand new CS6 which is why I am baffled
That is a project file, not a data (video or sound) file
When you copied from the DVD to your hard drive, did you copy with the complete folder structure, to a folder on your hard drive?
If you tell PPro to load a project file, and the various data files are not where the project expects, you may receive an error message
But, I have never worked with Classroom in a Book, so don't really know what the project files need to work