I am trying to install the FFTW libraries on my windows XP machine so I can integrate them into a project using the portaudio libraries in VS-2005. I am following these instructions; http://www.fftw.org/install/windows.html Precompiled FFTW 3.2.1 Windows DLLs install using fftw-3.2.1-dll.zip, on my Windows XP machine. I am executing this lib command: C:\Program Files\Microsoft Visual Studio 8\VC\bin>lib /machine:i386 /def:libfftw 3-3.def @../fftw-3.2.1-dll/libfftw3-3.def ...