If you are installing ANSYS FLUENT 14.5 on a Windows machine that already has one or
more previous versions of ANSYS FLUENT, then after installing Platform and Intel MPI
libraries from the prerequisites, make sure to delete the environment variables
MPI_ROOT (for Platform MPI) and I_MPI_ROOT (for Intel MPI). Otherwise there will be a
conflict while running previous ANSYS FLUENT versions in parallel mode.