This happened in the MacOS 9 version of Aleph One too if you had too little RAM since fullscreen mode required a lot more. I'm clueless 'bout the Windows version, since my own PC has been standing unplugged in a dusty corner of my room for a long time :-)
: Okay, another newbie question. I downloaded and installed Aleph One, but if I
: change the preferences to FullScreen, the game crashes immediately. Is
: this something I did, or is this a bug in the system. I am running the PC
: version, on Windows 2000.