We have BT internet, we don't like McAfee and we do like Norton, which we purchase separately. We've had no problem at all with Norton - can't understand why people are so anti it.
I used AVG free for years never had a problem, lately changed to MSE (Microsoft Essentials) and found it better, AVG seemed to be slowing down my PC. I'd never buy an anti virus ackage when there are so many free downloads online
Nobody should be paying for security options - MSE (Win 7; Vista; XP - "Defender" if Win 8) & Malwarebytes (free & run once a week) should be enough to ensure security - IMO, of course