[BioC] Problems loading biomaRt and XML

[Jordi Altirriba Gutiérrez]

Dear BioC users,
I am trying to run biomaRt, but I am not able to do it.
I install (in R under Windows OS) biomaRt through:
Packages -> Install package(s)
 -> biomaRt
Then I load it:

>library(biomaRt)
Loading required package: XML
Error: package 'XML' could not be loaded
Además: Warning message:
there is no package called 'XML' in: library(pkg, character.only = TRUE, 
logical = TRUE, lib.loc = lib.loc)

After this I install XML (without any problems) and I re-load biomaRt, but 
an error message appears in a new window (I am translating it, as the 
messages are in Spainsh):

The entrance point of _htmlDefaultSAXHandler procedure can’t be found in the 
library of dynamic links libxml2.dll

Moreover in the R window appears:

Loading required package: XML
Error in dyn.load(x, as.logical(local), as.logical(now)) :
        impossible to load the shared library  
'C:/ARCHIV~1/R/R-23~1.1/library/XML/libs/XML.dll':
  LoadLibrary failure:  The specified process was no found.
Error: .onLoad failed in 'loadNamespace' for 'XML'
Error: package 'XML' could not be loaded

I have removed R and reinstalled it, and repeated all the process; 
nevertheless the errors are the same. I have tried to found a solution in 
Google and gmane, although I don’t have been able to found it.

>sessionInfo()
Version 2.3.1 (2006-06-01)
i386-pc-mingw32

attached base packages:
[1] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"  
"base"

Many thanks in advance for your help!
Yours faithfully,

Jordi Altirriba
PhD student
Hospital Clinic, Barcelona, Spain