This happened to me in both 2012 and 2014 SQL Server installations (on a clean Windows 2012 R2 installation) and frustrated me to no end. It was super hard just to get all the extra apps uninstalled. What happens is that installation fails when installing Setup Support files. It just hangs and won’t go any further. For me, I even had a drive disappear (D Drive).

There are a few steps needed to go through this, including Merging a .reg file. Go here to get full details. It worked the very first time after completing these steps and rebooting:
http://blogs.msdn.com/b/sqljourney/archive/2012/05/07/sql-2008-2008-r2-setup-disappears-fails-when-installing-setup-support-files.aspx. As it turns out, there are fixes for 2008 through 2014, so it’s been a problem for a long time.