I've already ran the installer on a Windows 2012 R2 and it ran fine did you run the installer with the option run as administrator?
I did find a link for the sql installer problem
http://serverfault.com/questions/188123/installing-sql-server-2008-r2-32bit-on-64bit-wow64-error
I did find a link for the sql installer problem
http://serverfault.com/questions/188123/installing-sql-server-2008-r2-32bit-on-64bit-wow64-error
