[BioC] installation of Rgraphviz

[ravi]

Hi all,
I have followed the instructions for installing Rgraphviz (on a win XP pc with R2.9.0) at the following link :
http://genetics.agrsci.dk/~sorenh/Rpackages-SHD.html

I get the following mesage during the installation of Rgraphviz :
> source("http://bioconductor.org/biocLite.R")
> biocLite("Rgraphviz") 
Running biocinstall version 2.4.10 with R version 2.9.0 
Your version of R requires version 2.4 of Bioconductor.
Warning: unable to access index for repository http://brainarray.mbni.med.umich.edu/bioc/bin/windows/contrib/2.9
trying URL 'http://bioconductor.org/packages/2.4/bioc/bin/windows/contrib/2.9/Rgraphviz_1.22.0.zip'
Content type 'application/zip' length 1084292 bytes (1.0 Mb)
opened URL
downloaded 1.0 Mb

package 'Rgraphviz' successfully unpacked and MD5 sums checked

Further,I get the following error message  :

>  library(Rgraphviz)
Loading required package: graph
Loading required package: grid
Error in inDL(x, as.logical(local), as.logical(now), ...) : 
  unable to load shared library 'C:/Program/R/R-2.9.0/library/Rgraphviz/libs/Rgraphviz.dll':
  LoadLibrary failure:  Det går inte att hitta den angivna modulen.


Error : .onLoad failed in 'loadNamespace' for 'Rgraphviz'
Error: package/namespace load failed for 'Rgraphviz'

Does this tell enough to troubleshoot the installation problem? Please advise.
Thanking you,
Ravi