Call of Duty graphics ?

In my recent game buying spree I got CoD and CoD United Offensive.
I have a Geforce FX 5200 card and the game runs pretty good, some bad stuttering in heavy fire fights but that isn't my problem.
In some missions especially when dark out my guys will look as if they are coals smoldering in a campfire. It is only people not other objects, there is a "flickering" all over their bodies, including mine.
I have tried probably every graphic card setting and in game setting combination I can think of and can't stop this.
Any ideas?
The "smoldering souls" don't effect game play but are more of a annoyance.
I have a Geforce FX 5200 card and the game runs pretty good, some bad stuttering in heavy fire fights but that isn't my problem.
In some missions especially when dark out my guys will look as if they are coals smoldering in a campfire. It is only people not other objects, there is a "flickering" all over their bodies, including mine.
I have tried probably every graphic card setting and in game setting combination I can think of and can't stop this.
Any ideas?
The "smoldering souls" don't effect game play but are more of a annoyance.