Hi everyone!
Thanks for all the info/help, just in case anyone finds this thread in the future, the dfttest.dll isnt in the zip links provided in the previous comments, thats why it wasnt working
the correct link for the 2 files (libfftw3f-3.dll and dfttest.dll) is:
http://web.missouri.edu/~kes25c/dfttestv18.zip
Thanks everyone!