Message lors du lancement de Urban Terror

Bonjour,

lors que je lance Urban Terror, tout fraichement téléchargé, ce message s'affiche :

ioQ3 1.35urt win-x86 Dec 20 2007
----- FS_Startup -----
Going through search path...

----------------------
8032 files in pk3 files
execing default.cfg
couldn't exec q3config.cfg
execing autoexec.cfg
Hunk_Clear: reset the hunk ok
...detecting CPU, found AMD w/ 3DNow!
----- Client Initialization -----
Couldn't read q3history.
----- Initializing Renderer ----
-------------------------------
QKEY found.
----- Client Initialization Complete -----
----- R_Init -----
Initializing OpenGL subsystem
...initializing QGL
...calling LoadLibrary( 'C:\WINDOWS\system32\opengl32.dll' ): succeeded
...setting mode 4: 800 600 FS
...using colorsbits of 32
...calling CDS: ok
...registered window class
...created window@0,0 (800x600)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 32, 24, 8 )
...35 PFDs found
...GLW_ChoosePFD failed
...GLW_ChoosePFD( 32, 24, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...failed to find an appropriate PIXELFORMAT
...restoring display settings
...WARNING: could not set the given mode (4)
...setting mode 4: 800 600 FS
...using colorsbits of 16
...calling CDS: ok
...created window@0,0 (800x600)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 16, 16, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...failed to find an appropriate PIXELFORMAT
...restoring display settings
...WARNING: could not set the given mode (3)
...shutting down QGL
...unloading OpenGL DLL
...assuming '3dfxvgl' is a standalone driver
...initializing QGL
...WARNING: missing Glide installation, assuming no 3Dfx available
...shutting down QGL
----- CL_Shutdown -----
RE_Shutdown( 1 )
-----------------------
GLW_StartOpenGL() - could not load OpenGL subsystem

J'ai cherché, et trouvé qu'il fallait mettre a jour sa carte graphique... mais comment faire ?? ( S3 graphics ProSavage 8a26 ( Microsoft Corporation )) merci de vos réponses et de votre attention !