I downloaded some CBT Nuggests training ISO images and now when I try to burn any of them, I get this window saying that it is a foreign image. What I can see at the bottom of Nero 7 is that the image was made as a CD but the total size is greater than the CD. I have successfully burnt it on a DVD when I change the mode from CD to DVD. But when I try to access the burnt image on DVD, it will be blank. I have tried many approaches of extraction using different programs but all of them tell me that it is not a valid image. I don’t know how to fix this block size problem but if anyone else had a similar issue and have a solution, please let me know. By the way, I did search the forum for solutions but did not really found the one that works.