When I press ''Start Gunbot'' nothing happen, do i need to install something before ?
Thanks
This is most likely the case:
Maybe your Windows box didn't get node.js pre-installed. If this is the case and you get an error message alike "node is not a valid command" or similar, please follow the easy steps here
http://blog.teamtreehouse.com/install-node-js-npm-windows and start your GUNBOT again.
This happened to me the day before, I tried it on win server 2008, win10 and win7. No of those machines came with js pre installed so after testing on all my machines I PMd Gunthar, he's answer was "Install Node js"

it helped