OpenGL Prob With NVIDIA Card

Hi. I have a GeForce 6200 video card in a W2K machine, and just noticed that whenever I try to run an OpenGL app, it crashes immediately. (Even something as simple as a screensaver.)

I had the 84.21 NVIDIA Forceware drivers installed, and just upgraded to 91.47, but the problem persists.

Please let me know if you can help. Here are the stats for my machine and card:

Operating System: Microsoft Windows 2000 Professional (5.0, Build 2195)
DirectX Version: DirectX 9.0c (4.09.0000.0904)

  Video Card Name:  NVIDIA GeForce 6200
     Manufacturer: NVIDIA
        Chip Type: GeForce 6200
        DAC Type:  Integrated RAMDAC

Approx. Total Memory: 128.0 MB
Current Display Mode: 640 x 480 (16 bit) (60Hz)

    Monitor: Plug and Play Monitor
Main Driver: nv4_disp.dll
    Version: 6.14.0010.8421 (English)
WHQL Logo'd:    n/a
   Mini VDD:  nv4_mini.sys

      VDD:   n/a
       DDI:  9 (or higher)