The bartpe trick couldn't work with the registry to do it. However, I tried another install and I noticed if I try to make any changes to the drive (the raptor) during setup, like deleting a partition, creating a partition or formatting, it does the little wheel spinny trick then finishes, and my drive disappears from the list of drives in the "Where do you want to install Windows?".
I'll try another drive and see what happens.
Edit: I tried another drive (toshiba 2.5in), it does not have that symptom but after the first reboot during install, the pc prompts to boot from the cd, times out, then at the point where it would boot from the drive, my pc just sits there. It doesn't boot anything. I tried the startup repair from the 7 cd and it didn't find a problem. Bcdedit gave back what looks like valid entries.