ghost decompression error

I'm trying to backup my computer using Ghost. It did the backup without a problem. I did two partitions, and used a total of 7 dvd+r's.
When I tried to do the integrity check, both partitions said "decompression error" and said I had to make another backup, even when I answered do not abort.

Is there anything I can do to fix these dvd's, or do I have to do it over again with new dvd's? Is there any way to repair the images?
The first 2 disks of partition D went through fine. I'm guessing there's no way to keep them?

grrr... half a day and 7 dvd's later, and nothing to show for it!