
I found it pretty easy to install Rmpi in Windows through MPICH2.  The instructions on how to do this are detailed and clear, at http://www.stats.uwo.ca/faculty/yu/Rmpi/windows.htm. The only trouble I had is that I thought I was logged in as the administrator when I wasn't, even though the user name I used is listed as "Administrator", and the pc I use is simply my own personal pc at home, not part of a network.  Anyway, as Jayesh of the MPICH2 discussion group pointed out to me, I can be sure to execute as an administrator by getting to the command prompt icon (under Start Menu>All Programs>Accessories), right clicking on it, and selecting the "Run as Administrator" option.  Also, to run as administrator in R, I simply right-clicked on my desktop icon and selected "Run as Administrator".  

John Joseph

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