A Screenshot for the UI Hall of Shame

Okay, I'm a reasonably intelligent guy, so I was able to figure out what I need to do, but one could be excused, upon a straightforward reading of these messages, from concluding that the goal is impossible to reach due to conflicting requirements. I can't install AD until after I run adprep, but I can't run adprep until after AD is installed (which is what will make this computer a domain controller). What? Gah.