Call of duty-could not load opengl.

[im a thinker]

When trying to load call of duty, a fatal error repot comes up and says that it could not load opengl. Then it says to make sure that you have the latest drivers for your video card from the manufacturers website. My computer is not meant for gaming that much. Its a dell. I have the best video card in it that it can hold and im pretty sure its a 256 mb. I am able to play star wars republic commando, but im not able to play battlefield 2. So why is this message popping up if i was able to play call of duty a while ago, but not now?

COD 1.0 build win-x86 Oct 5 2003
----- FS_Startup -----
Current language: english
Current search path:
C:\PROGRA~1\CALLOF~1\main\pak6.pk3 (3 files)
C:\PROGRA~1\CALLOF~1\main\pak5.pk3 (4858 files)
C:\PROGRA~1\CALLOF~1\main\pak4.pk3 (1668 files)
C:\PROGRA~1\CALLOF~1\main\pak3.pk3 (1992 files)
C:\PROGRA~1\CALLOF~1\main\pak2.pk3 (694 files)
C:\PROGRA~1\CALLOF~1\main\pak1.pk3 (2642 files)
C:\PROGRA~1\CALLOF~1\main\pak0.pk3 (12828 files)
C:\PROGRA~1\CALLOF~1/main
C:\PROGRA~1\CALLOF~1\main\localized_english_pak1.pk3 (3736 files)
localized assets pak file for english
C:\PROGRA~1\CALLOF~1\main\localized_english_pak0.pk3 (1204 files)
localized assets pak file for english

File Handles:
----------------------
29625 files in pk3 files
execing default.cfg
couldn't exec language.cfg
execing config.cfg
couldn't exec autoexec.cfg
Hunk_Clear: reset the hunk ok
...detecting CPU, found Intel Pentium III
Measured CPU speed is 2.79 GHz
System memory is 511 MB (capped at 1 GB)
Video card memory is 64 MB
Streaming SIMD Extensions (SSE) supported

----- Client Initialization -----
----- Initializing Renderer ----
-------------------------------
----- 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 colorbits 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)
...shutting down QGL
...unloading OpenGL DLL
Forcing 640x480 resolution to allow OpenGL to run in fullscreen
...initializing QGL
...calling LoadLibrary( 'C:\WINDOWS\system32\opengl32.dll' ): succeeded
...setting mode 3: 640 480 FS
...using colorbits of 32
...calling CDS: ok
...created window@0,0 (640x480)
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 (3)
...shutting down QGL
...unloading OpenGL DLL
----- CL_Shutdown -----
RE_Shutdown( 1 )
-----------------------
Hunk_Clear: reset the hunk ok
Could not load OpenGL. Make sure that you have the latest drivers for your video card from the manufacturer's web site.