I tried uninstalling motorola drivers and reinstalling again and uninstalling and letting windows install the drivers automatically but no luck either way (and USB debugging is activated in the phone).
When I access to the device manager in the pc it shows a warning sign on Motorola ADB Interface saying the controllers for that device are not installed, that the manufacturer is unknown and that there aren't compatible controllers for the device (I'm translating what the pic says for those who don't understand spanish xD). I tried to uninstall that Motorola ADB interface thing but it remains there.
What can I do?
SOLUTION: See last post.