I've just built my BartPE environment that I want to use for various things instead of a bloated OS on my laptop. The issue is when I do this and make a bootable CD for BartPE using Nero 7, I get this:
CDBOOT: Cannot boot from CD - Code 4
What does this mean? I've disabled ;1 ISO extensions and such. Here's what I'm doing in Nero:

Any suggestions? I put all the PE files in the root of the CD area that's going to be burnt to disc. It just gives me that error when I reboot and boot from CD.
EDIT: I chose No Emulation instead of "Harddisk Emulation" in the first pic.
