Constant runtime crash in ACT 2 while switching scenes

In ACT 2, I have experienced constant runtime crashes while switching scenes (1 crash per 2-4 map area switches).

Error messages include "bad allocation", "ran out of memory", "viewofmap (or something like that)" and "unable to load XXX". All kinds of random error messages just pop up during the scene switching screen followed by runtime error.

I did run pack check. I did reinstall the game. And these did not help.

And yes I am using a 32-bit win 7 system.

So is there anything that can help?

Thanks.

I lowered the graphics setting to lowest and this never happens. But I still would like to set everything high since I have a good PC to run most games.