How to configure firewall for telewest broadband?

Hi

I installed Kerio on a friends pc that is connected to telewest cable broadband. Where at home I have to add almost every website I visit to the list of allowed sites, on his pc every site seemed to work fine without being added. Pop-ups were appearing too.

Can anyone suggest what is wrong?

I wondered whether it needed to be setup differently as the cable modem is connected via a network connection. Does this mean the modem is acting as another pc rather than a peripheral deveice and needs a different setup?

Thanks D