Finally got it working.
Anyone on Vista getting the bioshock fov fix to work.
Followed the instructions in the readme below. I run the fix, set my fov to 0.694 on both sliders. Leave the program running. Start the game. Press * on the numpad to enable the fov fix (numlock set to on..checked that), and zilch. Looks same with or without hack.
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Ive tried it and get the same result as you