I uninstalled, reinstalled (as administrator) and ran it both ways. Still I get only Attack in the West.
Note also that when I ran as administrator (right clicking, then choosing "run as administrator"), the era options didn't even exist. Instead I got the press any key button which started the game with Attack in the West. When double left clicking, after the popup that permits the game to run as admisistrator ("allowed"), I got the five eras, but no matter the choice, when the game started, it was No. 1.