Voila quand je lance quake 3 se message apparait:
Q3 1.11 win-x86 Nov 29 1999
----- FS_Startup -----
Current search path:
C:\Q3Ademo/baseq3
----------------------
Running in restricted demo mode.
----- FS_Startup -----
Current search path:
C:\Q3Ademo\demoq3\pak0.pk3 (1387 files)
C:\Q3Ademo/demoq3
----------------------
execing default.cfg
execing q3config.cfg
couldn´t exec autoexec.cfg
...detecting CPU, found Intel Pentium III
------- Input Initialization -------
Initializing DirectInput...
Couldn´t set DI coop level
Falling back to Win32 mouse support...
Joystick is not active.
------------------------------------
----- Client Initialization -----
----- Initializing Renderer ----
-------------------------------
----- Client Initialization Complete -----
--- Common Initialization Complete ---
Winsock Initialized
Opening IP socket: localhost:27960
Hostname: m7w0x0
IP: 142.137.3.170
Working directory: C:\Q3Ademo
----- R_Init -----
Initializing OpenGL subsystem
...initializing QGL
...calling LoadLibrary( ´C:\WINDOWS\SYSTEM\opengl32.dll´ ): succeeded
...setting mode 3: 640 480 FS
...using desktop display depth of 16
...calling CDS: ok
...registered window class
...created window@0,0 (640x480)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 16, 16, 0 )
...23 PFDs found
...GLW_ChoosePFD failed
...GLW_ChoosePFD( 16, 16, 0 )
...23 PFDs found
...GLW_ChoosePFD failed
...failed to find an appropriate PIXELFORMAT
...restoring display settings
...WARNING: could not set the given mode (3)
...setting mode 3: 640 480 FS
...using colorsbits of 16
...calling CDS: ok
...created window@0,0 (640x480)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 16, 16, 0 )
...23 PFDs found
...GLW_ChoosePFD failed
...GLW_ChoosePFD( 16, 16, 0 )
...23 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
Que faire 
