John,

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.

Regards,
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
>
>