[Rd] Updating library

[Gabor Grothendieck]

On Vista my R installation is in

  C:\Program Files\R\R-2.6.0

and there is a library here:

   %userprofile%\Documents\R\win-library\2.6

If I use the GUI Packages menu to update my library it
works ok _except_ for any packages such as lattice and
the VR bundle that come with R.  For those I get this (this
is what I got when I tried to update lattice but I get a similar
message for the VR bundle as well):

> update.packages(ask='graphics')
--- Please select a CRAN mirror for use in this session ---
Warning in install.packages(update[instlib == l, "Package"], l,
contriburl = contriburl,  :
  'lib = "C:/PROGRA~1/R/R-26~1.0/library"' is not writable
Error in install.packages(update[instlib == l, "Package"], l,
contriburl = contriburl,  :
  unable to install packages

I am using R-2.6.1 (even though the directory says 2.6.0) since I
tend to write over the prior directory if its just an upgrade involving
the last digit of the R version.

> R.version.string
[1] "R version 2.6.1 Patched (2007-12-06 r43610)"

How should I go about updating lattice and the VR bundle?