Problemer med OpenGL

Jeg kan ikke åbne spille medal of Hanor den skriver dette

Initializing OpenGL subsystem
...initializing QGL
...calling LoadLibrary( 'C:\WINDOWS\SYSTEM\opengl32.dll' ): succeeded
...setting mode 3: 640 480 FS
...using colorsbits 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
...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
GLW_StartOpenGL() - could not load OpenGL subsystem

Mit kort er RIVA TNT2 PRO
Windows 98
Hvad skal jeg gøre????