I am using the x86_64 distribution from the download page. I have no problems building the examples with both g++ and gfortran. I can run the cxxpi.cxx example using mpiexec with no problems but when I run the fpi.f example, I get this error message: /cygdrive/c/progra~1/MPICH2/bin/mpiexec.exe: error while loading shared libraries: ?: cannot open shared object file: No such file or directory Using dumpbin, I can see that cxxpi.exe imports mpich2mpi.dll while fpi.exe imports fmpich2g.dll and libgfortran_64-3.dll. The paths to both dlls are on my path. By the way, I can run fpi.exe directly from the command line with no problems. If anyone has ideas about what the problem is, I would be much obliged. Bill