COD4: Cannot open image shadow

Bonjour,
J' ai essayé de jouer a Call Of Duty 4 ce matin mais il n' a pas su l' ouvrir me notant Cannot open image shadow.
La console est alors apparue et m' a noté ceci:
Attempting 800 x 600 fullscreen with 32 bpp at 60 hz
Game window successfully created.
Using 2x 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...
Setting initial state...
ERROR: image 'images/statmon_warning_tris.iwi' is missing

Couldn't load image 'statmon_warning_tris'

J' ai achete Call Of Duty 4 sur Steam et il avait besoin de faire une mise a jour.Maintenant je ne sais plus y jouer help.Merci d' avance pour vos réponses