I got a firewall on purpose to keep Norton and Avast from spamming me . Some newly bought computers have a trial version that wants to connect to a spam generating server in Croatia or Nigeria or somewhere. McAfee is even more annoying. Put the firewall on before activating the computer, because Microsoft and Google are also bound to help fill up your bandwidth with useless rubbish or worse.
What is worse? Your box turns into a bot for viruses or sends out smut. I use a crapware cleaner on a new computer, too. Make sure that this cCleaner never connects to the internet, by blocking outbound connections otherwise it turns into a bot.