Is your friend able to open the CD to view the pictures, using his computer ?

How did your friend transfer the pictures from the camera to the disc - i.e. what application was used, if any ? It could be that he used an application which you did not have installed in your computer, probably an application which came with the camera. If this is so, then you will have to install the same application. The usual method is to use a card reader to access the pictures, copy to HD, then burn to CDs as data files.