Are you using VL6.0-STD-Gold.iso? If you are not, please tell us what version you have. If you are using VL6.0-STD-Gold.iso, check the md5sum of the download. It should be d132ad563da5bdab2a65b04fb6aa3b83 . If that matches, get the md5sum of the CD you burned and make sure it matches too. If the CD has the wrong md5sum, burn another one at speed 4X. That is slow, but sure.
If you have trouble or need more explanation, please tell us what operating system you are using to download and burn the CD's. I'm leaving for the day, but other people will help. Just ask any question you need.