Just as the title says.
I encounter this in the very first level. I have just gotten my message from the king, and am going out of the sewers/dungeons.... i go to the hatch in the floor, and it displays the loading screen, and then it crashes once its finished loading.
I by far meet all the specs, except for the possibility of graphics card. I'm running this on a laptop with an Intel chipset in it (Mobile Intel 965 Express Chipset Family). I have upgraded all drivers, and all of the typical troubleshooting problems with games.
I believe that it is simply the chipset causing issues... but i'm coming here for a definitive answer.

Yeah, that is more or less the norm for inadequate graphics hardware. Tutorial runs fine but the exterior world just kills it.

You may be able to get the game to run, see http://www.gamesas.com/index.php?/topic/868166-mobile-intelr-965-express-chipset/page__p__12655360__fromsearch__1&#entry12655360 for some details, though I personally couldn't live with the game like that.