Well, a staff member replied me in my private email, the service needed is "WinHTTP Web Proxy Auto-Discovery Service". But i was unable to make this service running, all choices was greyed. After this was not easy to fix it, i had to have control of the service in the registry, change type of start (type 2, auto) and then start the service. This in one computer, the other one was probably heavily compromised (the one i need keep working, obviously) and i've reinstalled the O.S. Once again, "thank you microsoft" for locking some features without telling anything.
Anyway, I think this info is important.
Thank you. Really. (please excuse my poor english).
LostSoul.