You may use guide below...
CD/DVD get scratched due to regular use. You can use following methods to recover data. I assure you that after using these methods, you will have all your data.
1. Clean the CD/DVD properly as dust can be a reason.
2. Use a CD/DVD writer instead a CD/DVD reader device for such corrupted disks, because DVD writer are more powerful than DVD reader.
3. If nothing happens, then you should opt for a third party data recovery software. This is the best way to recover data from CD/DVD/Blue-Ray disks.
Or in case guide can't assist you, make use of more powerful resources, which can give you more variants of restoration CD data
https://www.repairtoolbox.com/cdfreerepair.html CD Repair Toolbox Free
https://discuss.howtogeek.com/t/how-to-recover-data-from-corrupted-cd-disk/26571http://www.quora.com/How-do-I-recover-data-from-a-corrupted-CD-disk