Hi.. I am running R version 2.3.1 on a Windows XP machine with the latest Miktex 2.5 installed. I get no errors from R when running the Sweave example, 

testfile <- system.file("Sweave", "Sweave-test-1.Rnw", package = "utils")

However, when I tex the resulting .tex file (after installing a4.sty) I get the error below. 

This is pdfeTeX, Version 3.141592-1.30.6-2.2 (MiKTeX 2.5 RC 1)
entering extended mode
(Sweave-test-1.tex
LaTeX2e <2005/12/01>
Babel <v3.8g> and hyphenation patterns for english, dumylang, nohyphenation, ge
rman, ngerman, french, loaded.
("C:\Program Files\MiKTeX 2.5\tex\latex\base\article.cls"
Document Class: article 2005/09/16 v1.4f Standard LaTeX document class
("C:\Program Files\MiKTeX 2.5\tex\latex\base\size10.clo"))
("C:\Program Files\MiKTeX 2.5\tex\latex\ltxmisc\a4wide.sty"
("C:\Program Files\MiKTeX 2.5\tex\latex\ntgclass\a4.sty"))
! Missing \endcsname inserted.
<to be read again> 
                   \protect 
l.11 \begin
           {document}
? 
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