Lighting problem

[eljazzairi]

Hello,

 

I don't know why the lighting effects and shadows of the "blue palace" are completely non-existent ?

 

Check a normal game screenshot ;

 

http://images.uesp.net/1/13/SR-quest-Tending_the_Flames.jpg

 

Check this one in my game :

 

http://imageshack.us/f/28/tesv2012011211382787.jpg/

 

What's wrong ?

 

Config :

 

Win XP SP3

Opteron 180

Geforce 250 gts

2 GB memory

 

Thank you for your help