Have you checked if the disks were downloaded correctly? Transmission errors happen from time to time and result in broken images. Please visit http://www.md5summer.org/
and get the program, then visit the site you downloaded the images from and there should be a file MD5SUMS in the directory you got the images from. Download it, it's very small. Then open it. There are sums of the images you have. Then use md5summer to calculate the sums of the images you downloaded. The sums should be equal. If you get a pair that's not, you need to download the image again (and then check the sum). It looks that the sum of your 1st image is incorrect.
Also make sure you burned the images, not the image files. Look at the 1st cd. If there's one file on it, it's wrong. You should have many files and directories. You should burn the images again, make sure to use the option to burn the image, not the image file. (The options are different in different burning programs).