Sass on Windows is super simple.
Go to: http://rubyinstaller.org/downloads/ and download Ruby 2.0.0-p195. Install it. Then go to Start >> Ruby >> Start Command Prompt with Ruby. Then type `gem install sass`. You’re done.
Still in the command line, navigate to your Sass folder.
Then type: `sass –watch style.scss:style.css`
`style.scss` is the name of the Sass file, then `:`, then destination CSS file. You can also compile into different directory so: `sass –watch style.scss:../css/style.css`
Hope that helps,