Windows Install fails

Installation fails to build with this error:
I have vs2013, vs2012 and vs 2010 installed

```
> runas@1.0.1 install C:\Users\sam.critchley\AppData\Local\Temp\apm-install-dir-114914-3744-vowuva\node_modules\api-blueprint-preview\node_modules\pathwatcher\node_modules\runas
> node-gyp rebuild

C:\Users\sam.critchley\AppData\Local\Temp\apm-install-dir-114914-3744-vowuva\node_modules\api-blueprint-preview\node_modules\pathwatcher\node_modules\runas>node "c:\Chocolatey\lib\Atom.0.136.0\tools\Atom\resources\app\apm\node_modules\atom-package-manager\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild
Building the projects in this solution one at a time. To enable parallel build, please add the "/m" switch.
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Platforms\Win32\Microsoft.Cpp.Win32.Targets(511,5): error MSB8008: Specified platform toolset (v120) is not installed or invalid. Please make sure that a supported PlatformToolset value is selected. [C:\Users\sam.critchley\AppData\Local\Temp\apm-install-dir-114914-3744-vowuva\node_modules\api-blueprint-preview\node_modules\pathwatcher\node_modules\runas\build\runas.vcxproj]
```