an error occured during setup

I ordered the DVD..tried to upgrade but when it gets to "expanding files" (6%) I get error message "an error occured while preparing windows setup to boot into the next stage of setup" So...I then tried to install using the DVD's BOOT UP..(CLEAN INSTALL) and still get a simular message...
IF this DVD is BAD how can I get a replacement Vista DVD? And it does seem as if the DVD itself IS bad!
I checked $windows directory Setup log file but THAT was no help since it only has the setup info for my Windows Xp setup back in December 2005...