Edit the file "engine.ini". Find these lines:
Code:
full_screen = 1 ; 1 = Fullscreen mode, 0 - Windowed mode
screen_x = 1024 ; Horizontal resolution
screen_y = 768 ; Vertical resolution
If 'full_screen' is set to 1, try setting it to 0, and set 'screen_x' and 'screen_y' to match your own screen resolution. If 'full_screen' is set to 0, try setting it to 1.
Some players find that the game works better in windowed mode and that it can slow down in full screen mode. I'm the exact opposite; the last time I tried windowed mode, turning inside a building was extremely slow, so I leave it in full screen mode.
Some caves are indeed very dark. That's because there's no light.

If you're underground and nobody left any torches stuck to the side of the cave, or at least in this part of it, you can indeed expect not to see much. So there are a few places in the cave on Barbados where you are almost blind. On the other hand, you should have no trouble finding your way round the dungeons in Port Royale and Kralendijk.