Until now. Apparently unchecking the NT server box while setting up my home configuration wiped out my profile, so when I rebooted I was locked out of my own computer. Is there anything worse in the world than not being able to LOG IN?
I dropped off my laptop at the Royer Center in hopes that their excellent technician, Sean, could fix this and save me another round trip to DuBois. He wasn't there, but they expected him back today. He was. And he fixed it. He is the man. I can LOG IN.