WINDOWS USERS SOLUTION:
Check the sha1sum of the iso files.
-find and download sha1sum (google search)
-drop the sha1sum.exe in the same directory as the iso files
-open start-run-cmd and navigate to the folder with the iso's and sha1sum.exe
-type in the command prompt
sha1sum.exe FC-5-i386-disc1.iso FC-5-i386-disc2.iso FC-5-i386-disc3.iso FC-5-i386-disc4.iso FC-5-i386-disc5.iso
-check the results against the following