| If this would be a cpu context switch problem, the game would crash irregulary but not only if you open the closeup of your character. Also the game runs smoothly on my core duo (E6400). So chances are low that setting cpu affinity will help.
It sounds like a problem with your graphics card or RAM, but it's hard to pin this down without taking a look on your system.
So, first of all you should do the usual stuff, like upgrading your graphics card drivers, your DirectX 9 installation and your Windows XP to Service Pack 2. If upgrading does not help, you should check you RAM with a program like memtest86. |