bad clusters on backup disk!! Help!!

My system crashed and I used the restore cd to get it back up. After installing the quickbooks software I used the restore command and inserted the back up disks as instructed. On disk 2 there are bad clusters that information is written on but I can not get it to read. I have run scan disk but the disk is full and can not relocate the information. I have tried to copy the disk to my hard drive but it will not read. Is there any hope of recovering my 3 plus years of information. I am at the end of my rope. I backed up everyday and thought I was protected. I had no idea the disk was bad.