I have a Dell XPS M1330 running windows 7 Ultimate x64. I am trying to install from the iso, but the screen with the beta fish just sits there and never does anything.
Try again by downloading from this site: Windows 8 Consumer Preview ISO formats
Burn with Imgburn (Free) at a lower speed, install again, try using RW disc for burning as these can be used again.
Hope you are installing in another separate partition as dual boot.