First of all, thank you for your answer, I appreciate it!
Yea, I tried "google.com" without the "www" part but it still doens't work.
And right now I'm browsing the web and Inet Protector shows "Internet Disabled"... really weird, it seems it doens't work at all! And I chose the option "Block websites listed here and Allow only Allowed Programs, Services, Sites and FTP"
I have no proxy on my machine, only a firewall (COMODO) but I already allowed Inet Protector as a trusted application.
I've already checked everything on my machine and I still don't understand why it doesn't work... Any other idea?