Well for me going to a single partition on my RAID0 setup worked for me, it did finally install and i have been using it ever since. So I hope that helps. It seems to be a different problem to fix for everyone with this problem, from weird ram problems all the way dow to driver issues, but...
I'm having the same problem, its been 30min now on a second install attempt, and I am still staring at the "setup is starting" screen. Doing a clean install, this system previously had vista64 ultimate on it, butr i wiped the drive for win7 64bit. system specs: Amd phenom 9750 asus M3N78pro...