Required Files:
OpenAL32.dll (C:\Windows\System32)
wrap_oal.dll (C:\Windows\System32)
Tao.OpenAl.dll (C:\Program Files\TaoFramework\bin)
Tao.OpenGl.dll (C:\Program Files\TaoFramework\bin)
Tao.SDL.dll (C:\Program Files\TaoFramework\bin)
alut.dll (C:\Program Files\TaoFramework\lib)
SDL.dll (C:\Program Files\TaoFramework\lib)
SDL_mixer.dll (C:\Program Files\TaoFramework\lib)
Copy them to the OpenBVE folder. Is that helpful enough?