I'm installing El Capitan on a MacBook Air that I aquired with no internal drive, so no previous OS.
I proceed through several steps fine until "Create a Computer Account".
But it doesn't like the details I enter and shows this cryptic error box:
The name you entered can't be used.
The name is not available. Enter a different name.
The worst part is that it now does not allow me to edit any of the text fields! I can click on them and drag and select them, but I cannot type new letters or delete existing letters, etc.
Is this a known problem? I can't find a solution to it via Google though I do find a tiny number of people asking about it. If not, what am I missing?