system
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lol,…yes I know the issue of constantly clicking “yes”.
The problem with firewalls is,…that many people (including myself I suppose) do not always know what the firewall excactly means,…
Which modest computeruser can honnestly say when the firewall alerts,…what it exactly means,…
Some alerts are pretty obvious: e.g. you installed MSN Messenger, and you want to connect to chat with your friends,…the firewall says “may I let MSN Messenger access the Internet?” Off course you will click “yes” cause otherwise you will have no chat! 
Others are not that obvious,… and after a while you do not pay attetion and autoclick yes,…because you “assume” it is safe 