Open the CD. Open a Folder of photos. Open iPhoto. Set the two windows so you can see them side by side.
Click once in the Folder of photos window and then, on your keyboard, hold down the
Apple 
key plus the
A key. This will Select
All the photos altogether. You can then release the two keys on your keyboard and then simply click down on just any photo and drag the whole lot into the iPhoto window.
The menus equivalent of
Apple 
and
A is to: Click on menu item:
Edit and scroll down to:
Select All.
This is a System wide command and will work with selecting all of anything, regardless of what you are working in.