Hi Sam, Please refer to this FAQ: http://wiki.mpich.org/mpich/index.php/Frequently_Asked_Questions#Q:_Why _can.27t_I_build_MPICH_on_Windows_anymore.3F -Antonio On Wednesday, July 10, 2013 02:26:49 PM Sarath Samarasekara wrote: Hi,I am trying to install MPICH2 in my PC (running widows 7, 64 bit).I have tried with the following versions, but I couldn't do a successful installation.MPICH2-1.0.6p1-win32-ia32MPICH2-1.4.1p1-win- ia32MPICH2-1.4.1p1-win-x86-64MPICH2-1.0-1-win32-ia32Administrator command prompt used.I have added C:\Program Files\MPICH2\bin" to system PathControl panel- Administrative tools-Services shows MPICH2 but it doesn't show SMPD.SMPD -status just hangs at the command prompt. Following is an output of SMPD -status -d for you information.What am I missing?. How do I get this going? Thank you for your advice in advance. Regards,Sam C:\>smpd -status -d[-1:3564].. \smpd_get_opt_int[-1:3564]../smpd_get_opt_int[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt_int[-1:3564]../smpd_get_opt_int[-1:3564].. \smpd_get_opt_int[-1:3564]../smpd_get_opt_int[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt_string[-1:3564]../smpd_get_opt_string[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_hostname[-1:3564]../smpd_get_hostname[-1:3564].. \smpd_get_opt_string[-1:3564]../smpd_get_opt_string[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt_string[-1:3564]../smpd_get_opt_string[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt_string[-1:3564]../smpd_get_opt_string[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt_string[-1:3564]../smpd_get_opt_string[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt_string[-1:3564]../smpd_get_opt_string[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_get_opt_string[-1:3564]../smpd_get_opt_string[-1:3564].. \smpd_get_opt_string[-1:3564]../smpd_get_opt_string[-1:3564].. \smpd_get_opt[-1:3564]../smpd_get_opt[-1:3564].. \smpd_do_console[-1:3564]...\smpd_get_smpd_data[-1:3564].... \smpd_get_smpd_data_from_environment[-1:3564]..../smpd_get_smpd_data _from_environment[-1:3564].../smpd_get_smpd_data[-1:3564]... \SMPDU_Sock_create_setno smpd running on PC[00:3564].../smpd_do_console[00:3564]...\smpd_exit[00:3564].... \smpd_kill_all_processes[00:3564]..../smpd_kill_all_processes[00:3564].... \smpd_finalize_drive_maps[00:3564]..../smpd_finalize_drive_maps C:\>