I have had the problem with the transition crashes as well, especially for Guilded Vale.
I am running Windows XP SP3 with 4gb RAM
And I managed to fix this issue for me by using this switch: http://www.maxi-pedia.com/3GB+switch+Windows+boot.ini+3+GB
The problem with crashing has disappeared completly since then.
But it requires some effort and knowledge, and please be cautious when modifying parameters that are critical to your OS.