problems with loading geoR and sp

hey guys, i'm trying to work with CRAN package geoR. I installed it but 
loading it needs a shared library(sp). So i downloaded sp as well and 
installed it successfully. but when i load the library(sp) it says that 
it was not found and the warnings say it was constructed under r version 
and so on. So what is going on there? Is there a different way of 
installing some packages? I attached the original error messages. only 
they are in german - mabe someone understands...

thank you! Anna

here's the error message:


 > library(sp)

Error in library.dynam(lib, package, package.lib) :
   shared library 'sp' nicht gefunden
Zus?tzlich: Warnmeldung:
Paket 'sp' wurde unter R Version 2.12.1 gebaut
Fehler: Laden von Paket/Namensraum f?r 'sp' fehlgeschlagen

 > library(geoR)

Lade n?tiges Paket: sp
Error in library.dynam(lib, package, package.lib) :
   shared library 'sp' nicht gefunden
Zus?tzlich: Warnmeldungen:
1: Paket 'geoR' wurde unter R Version 2.12.1 gebaut
2: Paket 'sp' wurde unter R Version 2.12.1 gebaut
Fehler: Paket 'sp' konnte nicht geladen werden