Dear all,
I am facing the same problem. I followed the all instructions given in help file and some steps of previous discussion (from google search) but I could not install package Rgraphiviz in windows.  I tried even the instructions given to install Bioconductor package then only able to install in Linux systems but not in Windows. In my opinion, Graphiviz package which creating problems in installation of Rgraphiviz packageis, is doing something wrong or needs some special requirements .
 
If some body have idea regarding this problem, I am also enthusiastic to see the solution.
Pls, if you find solution, let me know.
Thanks
 
Truly,
Ram Kumar Basnet,
Graduate student,
Wageningen University,
The Netherlands.


--- On Tue, 12/2/08, Prof Brian Ripley <ripley@stats.ox.ac.uk> wrote:

From: Prof Brian Ripley <ripley@stats.ox.ac.uk>
Subject: Re: [R] Can't load Rgraphviz on windows-based R
To: "Daren Tan" <daren76@hotmail.com>
Cc: r-help@stat.math.ethz.ch
Date: Tuesday, December 2, 2008, 1:47 AM

Rgraphviz is a Bioconductor package, so please ask on the apporpriate 
mailing list (see the posting guide).

On Tue, 2 Dec 2008, Daren Tan wrote:

>
> Hi,
>
> I have problem loading Rgraphviz. Following the instructions specified by
the README in Rgraphviz_1.20.3.tar.gz didn't help either.
>
> o. set the following Windows environment variables accordingly
>   (control panel -> systems -> Advanced -> Environment Variables
):
>   (a) create new user variables:
>     GRAPHVIZ_INSTALL_DIR   (e.g., C:\Graphviz-2.21)
<-------------------------- I stated C:\Graphviz-2.21 (I also tried
C:\/Graphviz-2.21)
>     GRAPHVIZ_INSTALL_MAJOR (e.g., 2)               
<-------------------------- I stated 2
>     GRAPHVIZ_INSTALL_MINOR (e.g., 20)              
<-------------------------- I stated 21
>     Notice the way "\/" are used for the paths above.
>   (b) add to user variable 'path': $GRAPHVIZ_INSTALL_DIR/bin
>     e.g., C:\Graphviz-2.21\bin                     
<-------------------------- I stated C:\Graphviz-2.21\bin (I also
tried C:\/Graphviz-2.21\/bin)

It should be 'PATH', not 'path': environment variables are
case-sensitive 
(in general, not sure what happens with PATH if set there).

>> library("Rgraphviz")
> Error in inDL(x, as.logical(local), as.logical(now), ...) :
>  unable to load shared library
'D:/PROGRA~1/R/R-28~1.0/library/Rgraphviz/libs/Rgraphviz.dll':
>  LoadLibrary failure:  The specified module could not be found.

That does not mean Rgraphviz.dll: it means a dependent DLL.  You did 
actually install graphviz, I presume?

> In addition: Warning messages:
> 1: closing unused connection 4
(D:/PROGRA~1/R/R-28~1.0/library/Rgraphviz/libs/Rgraphviz.dll)
> 2: closing unused connection 3
(D:/PROGRA~1/R/R-2.8.0/library/Rgraphviz/libs/Rgraphviz.dll)
> Error : .onLoad failed in 'loadNamespace' for 'Rgraphviz'
> Error: package/namespace load failed for 'Rgraphviz'
>
>>
file.exists("D:/PROGRA~1/R/R-28~1.0/library/Rgraphviz/libs/Rgraphviz.dll")
> [1] TRUE
>
>> sessionInfo()
> R version 2.8.0 (2008-10-20)
> i386-pc-mingw32
> locale:
> LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
> attached base packages:
> [1] grid      stats     graphics  grDevices utils     datasets  methods  
base
> other attached packages:
> [1] graph_1.20.0
> loaded via a namespace (and not attached):
> [1] cluster_1.11.11 tools_2.8.0
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.



      
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