title: unable to install ggplot2 from library nor .zip
body: <p>I have looked at many topics regarding the installation of ggplot2, but haven't encountered my problem.</p>
  
  <p>I'm using R studio version 0.97.332. I have already installed sm and extremevalues without any problems, but I'm unable to install ggplot2.</p>
  
  <p>I have tried the following two ways and neither one of them works.</p>
  
  <pre><code>install.packages("C:\\Temp\\ggplot2_0.9.3.1.zip", repos=NULL,                   
  lib.loc="...\Documents\\R\\win-library\\2.15")
  Installing package(s) into ‘...\Documents/R/win-  
  library/2.15’ (as ‘lib’ is unspecified)
  inferring 'repos = NULL' from the file name
  package ‘ggplot2’ successfully unpacked and MD5 sums checked
  Warning in install.packages :
    unable to move temporary installation         
  ‘\\..\Documents\R\win-
  library\2.15\file15c06ecb4488\ggplot2’ to         
  ‘\\...\Documents\R\win-library\2.15\ggplot2’
  </code></pre>
  
  <p>I have manually deleted any corrupted(?) folder of ggplot2, but this didn't work either
  Nor did manually moving the folder worked.</p>
  
  <pre><code>install.packages("ggplot2")
  Installing package(s) into ‘\\.../Documents/R/win-        
  library/2.15’
  (as ‘lib’ is unspecified)
  trying URL 'http://cran.rstudio.com/bin/windows/contrib/2.15/ggplot2_0.9.3.1.zip'
  Content type 'application/zip' length 2665534 bytes (2.5 Mb)
  opened URL
  downloaded 2.5 Mb
  
      package ‘ggplot2’ successfully unpacked and MD5 sums checked
      Warning in install.packages :
        unable to move temporary installation         
      ‘\\...\Documents\R\win-
      library\2.15\file15c0758038ea\ggplot2’ to 
      ‘\\...\Documents\R\win-library\2.15\ggplot2’
  
      The downloaded binary packages are in
  C:\Users\...\AppData\Local\Temp\RtmpmocnrL\downloaded_packages
  </code></pre>
  
  <p>I have tried the same approach to install corrplot, which didn't work either.</p>
  
  <p>Any help would be appreciated, I have tried it many times now...</p>