Do you have the original ISO file? Where was it downloaded from? Try burning it using ImgBurn at 4x speed with Verify - it never fails. If it fails then, you will know it is a bad download which can then be checked for sure and red-downloaded.
Make sure you are following these steps to boot the DVD:
Boot from CD - How to Boot your Computer from a Bootable CD or DVD - Boot to CD
Once you boot the DVD, select Custom install, then use Drive Tools to delete all partitions, create New one(s) as you wish, then format before installing to first partition.
Let us know how this goes. There are other troubleshooting steps if the install fails once you know the ISO and DVD burn are good, and you are booting correctly.