Try to segment the issue. Its a very broad statement that you are unable to update antivirus.
Are you using proxy? Are you using outgoing firewall?
Usually antivirus programs communicate on port 8014 if not port 80. Try to disable proxy and outgoing firewall and see how it goes?
Hi !!! ... yes i'm using a proxy ...
there is a way of passing information on the side of the proxy?
thanks for your answer