Install Git for windows and add it on path environment (How to setup environment variables on windows).
Install Ruby for windows and add it on path environment var. After associate .rb and .rbw files with this Ruby interpreter.
Finally install Capifony:
C:\> gem -v > 2.0. C:\> ruby -v ruby 2.0.2p247 (2013-06-27) [x64-mingw32] C:\> gem install capifony --verbose (Wait until download and it's ready)