Like Zedric said...thats the first thing to check. If that is ok then you might want to run md5sum on the CD itself. I cut this out of the Lycoris FAQ. Follow the instructions to see if the ISO image you downloaded is ok.
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I was asked to check the md5sum of the iso I downloaded. How?
First, locate the md5sum file for the iso...it should be in the same directory on the ftp server where you found the iso file. Then, perform one of the following:
If using Desktop/LX:
Run Konsole
md5sum path_to_iso_file/name_of_iso_file
Once the program finishes (it may take a few minutes), you should see a long number. Compare the number with the one that is in the md5sums file on the ftp site. If they match, great! If they do not match, try to download (or better yet, rsync) the iso file again.
exit, then exit to close Konsole
If using Microsoft Windows:
Download an md5sum utility, such as the one from
ftp://ftp.freebsd.org/pub/FreeBSD/tools/md5.exe. Place the utility in your windows (or winnt) directory.
Open a command prompt window. (On Windows 2000, go to Start, Programs, Accessories, Command Prompt)
md5 path_to_iso_file/name_of_iso_file
Once the program finishes (it may take a few minutes), you should see a long number. Compare the number with the one that is in the md5sums file on the ftp site. If they match, great! If they do not match, try to download (or better yet, rsync) the iso file again.
exit to close the Command Prompt window
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Good Luck!