Erreur sur call of duty 5 sur pc

Bonjour,
je viens d'installer avec succes call of duty world at war, mais quand je le lance, j'ai a l'ecran le logo du jeu puis apres un ecran noir, puis un message d'erreur:

----- Initializing Renderer ----
execing ragdoll.cfg from disk
----- Client Initialization -----
----- Client Initialization Complete -----
Trying SMP acceleration...
...succeeded.
----- R_Init -----
Getting Direct3D 9 interface...
Pixel shader version is 3.0
Vertex shader version is 3.0
Shader model 2.0 code path is available.
Shader model 3.0 code path is available.
Using Shader model 3.0 code path because it is the best available path on this hardware.
Attempting 800 x 600 fullscreen with 32 bpp at 60 hz
Game window successfully created.
Using 4x anti-aliasing
Creating Direct3D device...
Com_TouchMemory: 0 msec. Using sum: 0
Loading fastfile code_post_gfx
Loading fastfile ui
Loading fastfile common
Initializing render targets...
Requested frame buffer to be 24-bit color with 8-bit alpha
DirectX returned a frame buffer that is 24-bit color with 8-bit alpha
Initializing static model cache...
Initializing dynamic buffers...
Initializing particle cloud buffer...
Creating Direct3D queries...
Loading fastfile 'code_post_gfx'
used 1.13 MB memory in DB alloc
Setting initial state...
DirectX reports 256 MB of video memory and 428 MB of available texture memory.
Using video memory size to cap used texture memory at 240 MB.
Texture detail is set automatically.
Using picmip 0 on most textures, 1 on normal maps, and 3 on specular maps
Waited 15 msec for asset 'clear_alpha' of type 'material'.
Waited 6 msec for asset 'depthprepass' of type 'material'.
Waited 1 msec for asset 'shadowclear' of type 'material'.
Waited 11 msec for asset 'shadowcookieoverlay' of type 'material'.
Waited 658 msec for asset 'shadowcaster' of type 'material'.
Waited 10 msec for asset 'stencilshadow' of type 'material'.
Waited 280 msec for asset 'cinematic' of type 'material'.
Error: Waited 166 msec for missing asset "water_droplet".
Error: Could not load material "water_droplet".
Error: Could not load material "water_dynamic_spray".

------- sound system initialization -------
Loading fastfile 'ui'
used 39.48 MB memory in DB alloc
Waiting for $init to finish. There may be assets missing from code_post_gfx.


Error during initialization:
Unhandled exception caught


Com_TouchMemory: 0 msec. Using sum: 0



ce que je retiens c'est : Error during initialization: jai desinstallé, réinstallé, mais tjours pareil, jai cru comprendre que pas mal demonde avait eu ce probleme, si quelqu'un avait résolu le sien, si il pouvait m'expliquer comment faire ??? ça serait cool, merci !!