I'm running Mathematica 9 on a 64 bit Windows 8.1 laptop. I'm having no luck getting C compilation to work.
    
    Needs["CCompilerDriver`"]

    CCompilers[Full]
    CCompilers[] 

returns
>     
    {}  
    {}

The package did load successfully, as `$Packages` shows `CCompilerDriver` entries and

    $ContextPath//First

returns

>     "CCompilerDriver`"

I have the following compilers installed:

 - Microsoft Visual Studio Professional 2013
 - Intel C++ Composer XE