http://www.r-statistics.com/2013/03/updating-r-from-r-on-windows-using-the-installr-package/
http://www.r-statistics.com/2011/04/how-to-upgrade-r-on-windows-7/
http://www.r-statistics.com/2010/04/changing-your-r-upgrading-strategy-and-the-r-code-to-do-it-on-windows/
http://stackoverflow.com/questions/1401904/painless-way-to-install-a-new-version-of-r-on-windows
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http://www.r-statistics.com/2011/04/how-to-upgrade-r-on-windows-7/
http://www.r-statistics.com/2010/04/changing-your-r-upgrading-strategy-and-the-r-code-to-do-it-on-windows/
http://stackoverflow.com/questions/1401904/painless-way-to-install-a-new-version-of-r-on-windows