Try burning another DVD with ImgBurn (not poweriso) and use 2x or 4x burn speed. Test the ISO by booting it in a virtual machine to see if it can get through the entire install.
You have to do: -check sum of your iso file before burning -use a reliable burning software, nero, alcohol........etc -use a quality dvd disc. Don't use the cheap ones -check you dvd rom, is it still ok???
Why not just save yourself much trouble and DVDs by using a flash drive? I have an 8 giger with Professional and Ultimate on it...that is all I will ever need.