I tried to download the MPICH2 but both x86 and x86_64 are page not found. http://www.mpich.org/files/tarballs/1.4.1p1/mpich2-1.4.1p1-win-ia32.msi http://www.mpich.org/files/tarballs/1.4.1p1/mpich2-1.4.1p1-win-x86-64.msi where else can I found it ?? Regards, _____________________ Heba Khaled Ahmed Assistant Lecturer, Department of Computer Systems, Faculty of Computer & Information Sciences, Ain Shams University, Cairo, Egypt.