Hmm.. Because i'm getting tired if working blind... Do this:
Select 3.6.9 debug build. Select mediavps mod. Run the game until it crashes or you reach main hall. Quit the game. Open fs2_open.log (in data directory) and post the stuff from the beginning of that file until (and including) the following section (OpenGL/Direct3D init).
... OpenAL successfully initialized!
GR_CPU: Family 6, MMX=Yes
Initializing OpenGL graphics device at 1024x768 with 32-bit color...
Initializing WGL...
Requested WGL Video values = R: 8, G: 8, B: 8, depth: 24, double-buffer: 1
Actual WGL Video values = R: 8, G: 8, B: 8, depth: 24, double-buffer: 1
OpenGL Vendor : ATI Technologies Inc.
OpenGL Renderer : RADEON 9800 x86/MMX/3DNow!/SSE
OpenGL Version : 2.0.5885 WinXP Release