Hey Dan,
I'm unfortunately not very knowledgable with issues of OS compatibility.
I did some research and from what I understand, Windows XP doesnt support DirectX 10 or 11. So technically, the game would not run. But to address your issue directly, I am unable to test if the game is stable with 32bit operating systems. So it's possible the game is not stable or it just doesn't work with Windows XP's architecture.
I'll continue to do research to find a solution. If you find a solution, please let us know.
Thank you!