title: R error installing package on start
body: <p>When I start R on my windows machine, I get below log. Why do i get 2 errors below? how could I debug them? Is the problem associated with packages Arules and Matrix? Why do I get this error only for these 2 packages? I also installed rest of the packages in the same location...</p>
  
  <p>What does it mean when it says "    The following objects are masked from ‘package:base’:
  "?</p>
  
  <pre><code>R version 3.1.0 (2014-04-10) -- "Spring Dance"
  Copyright (C) 2014 The R Foundation for Statistical Computing
  Platform: x86_64-w64-mingw32/x64 (64-bit)
  
  
  R is a collaborative project with many contributors.
  Type 'contributors()' for more information and
  'citation()' on how to cite R or R packages in publications.
  
  Type 'demo()' for some demos, 'help()' for on-line help, or
  'help.start()' for an HTML browser interface to help.
  Type 'q()' to quit R.
  
  [Workspace loaded from ~/.RData]
  
  **Error installing package: 'C:\Program' is not recognized as an internal or external command,
  operable program or batch file.
  
  Error installing package: 'C:\Program' is not recognized as an internal or external command,
  operable program or batch file.**
  
  Loading required package: arules
  Loading required package: Matrix
  
  Attaching package: ‘arules’
  
  The following objects are masked from ‘package:base’:
  
      %in%, write
  </code></pre>