title: R CRAN, install library Rcpp fails after R3.2 upgrade
body: <p>I upgraded from R-3.1 to R-3.2. OK ( Standard upgrade)</p>
  
  <p>But this upgrade seems to have lost all the installed packages ( ggplot2, quantmod, Rcpp among dozens and dozens of others).</p>
  
  <p>So installed many from the RStudio tools menu option. Most were successful. But problem with Rcpp (when installing as dependency from ggplot2). The same issue occurs when installing package <code>data.table</code>:</p>
  
  <pre><code>Warning in install.packages :   unable to move temporary installation
  ‘C:\Users\euclid\Documents\R\win-library\3.2\file40fc19bc2752\colorspace’
  to ‘C:\Users\euclid\Documents\R\win-library\3.2\colorspace’ package
  ‘Rcpp’ successfully unpacked and MD5 sums checked Warning in
  install.packages :   unable to move temporary installation
  ‘C:\Users\euclid\Documents\R\win-library\3.2\file40fc53e26272\Rcpp’ to
  ‘C:\Users\euclid\Documents\R\win-library\3.2\Rcpp’
  </code></pre>
  
  <p>Note: The identical error occurs when installing package Rcpp on its own.</p>
  
  <p>Any suggestions appreciated.</p>