Do you have native Windows emacs or cygwin emacs? I use native emacs on XP with the latest released ess and org-mode, and have no problems with calling R from babel. I do not set the org-babel-R-command which has its default value "R --slave --no-save" and let ess find path to R on my system.

Alex

On Thu, Jun 28, 2012 at 12:46 PM, John Hendy <jw.hendy@gmail.com> wrote:

I typically use orgmode + babel on Linux and have no problems. Trying
to run on Windows 7 and having issues...

The pertinent bits from .emacs:
----------
;; setup babel
(add-to-list 'load-path "~/.emacs.d/ess-12.04/lisp")
(require 'ess-site)
(setq org-babel-R-command "C:/Program\ Files/R/R-2.15.0/bin/R")
(org-babel-do-load-languages
'org-babel-load-languages
'((latex . t)
(R . t)))
----------

When I try to execute a simple R src block, I get: "The system cannot
find the path specified." I get the same with or without setting the
org-babel-R-command path and with or without using R.exe instead of
just R.

There's an *ESS* buffer that /appears/ to be finding the versions of R
on my machine:
----------
[ess-site.el]: ess-customize-alist=nil
[ess-site.el _2_]: ess-customize-alist=nil
(R): ess-r-versions-create making M-x defuns for
R-2.15.0-64bit
R-2.14.1-64bit
----------

Any suggestions?

Best regards,
John