can't open opengl subsystem FX 5200

hi,
first sorry for my bad english
I hope this subject was not yet posted. Here is my problem :
I have a nvidia FX5200, W98SE. drivers 61.76. Direct X 9.0b

When I try to play games from Lucas art (jK2 or JK3) I have the message can’t open opengl subsystem(the whole message is :
nitializing OpenGL subsystem
…initializing QGL
succeeded
…setting mode 4: 800 600 FS
…using desktop display depth of 16
…calling CDS: ok
…registered window class
…created window@0,0 (800x600)
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 (4)
…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
)

. When I try to play Knights of The Old Republic, the game says that GL status failed because of bad version op opengl(should have 1.3 minimum). On sandra sisoft 2004 it says that I have not opengl and that I must install it.
My card shows that I have opengl 1.4.
I tried to unsinstall drivers of the card and reinstall, no effect.
Theses games worked before I reinstall a new disk and windows.
Has somebody an idea?
Thanx a lot

found it finally
a problem in my win.ini in the [drawdib] section.
the line “DVA=0” must be deleted.
don’t know where I caught this instruction.
Anyway it works now