i have a dvd-rw that has about 60 pictures that are all aprox. 4000-6000 KB in size. the disc was given to me by a professional photography company. when i insert the disc into the computer, it says that the pictures are there and it's taking up space. problem is: when i click on the picture, it says that theres "no preview available". only 4 pictures show the actual image out of the 60 pics i have on the disc. the others aren't opening. i was wondering if the files are broken or if the disc itself has a problem. what should i do to fix and see the photos? it's really important.
PLEASE HELP!

thanks! 10 points to the one who answers my questions and places forward a helpful solution.