Downloaded the consumer preview last night. Burnt ISO file to a DVD and tried to install it. I can get to the part where I enter the key. Then right after the part where it asks me which files i would like to keep, i get an error no matter which selection i try.
Windows installation encountered an unexpected error. Verify that the installation sources are accessible, and restart the installation.
4GB DDR3 1333 MHz
500 GB WD Black
USB DVD Drive
Tried different options in the windows install. No luck. Made sure i downloaded 64 bit for 64 bit.
Also tried launching the ISO with Daemon Tools but I get the same error even sooner.
What I found is that this can happen when there are applications you have to uninstall for compatibility reasons or if there are automatic updates pending installation/reboot.
What I did to clear this up was to remove the C:\$WINDOWS~BT directory completely. You will have to show system and hidden files to see this directory, but once it is gone the Windows 8 installation will restart from scratch.