di Juan Leyva.
Hi,
I just tested the latest version in Windows (Windows 8.1) and gulp works fine, I cannot test in Windows 7 sorry
What version of Node is installed in your computer? Please, review again your requeriments and this guide:
https://docs.moodle.org/dev/Setting_up_your_development_environment_for_Moodle_Mobile_2#Requirements
Juan