Hello ... thanks for your time and your answer.
I downloaded the last version of Gtalk for windows vista and still doesn't work, I downloaded Gtalk version for WinVista 64 and nothing... with Nod32 antivirus is the same thing... I think the problem is about any software, like windows firewall or something like that, because the Network and Sharing Center shows connection between my PC and proxy is OK, but connection between proxy and internet is marked with "X". I checked all services and it seems to be OK, I turn off the firewall and I can't connect that softwares: Gtalk, JAJC chat and NOD32. They says the same: Cant open sockets.
I'm thinking in reinstall Windows Vista.... But that is too sad.....