Just come back online - thank you for your replies.
Am I getting this right ?
AVG = anti-virus
ZoneAlarm = firewall
Are there any anti-spam suggestions? Especially as McAfee thinks emails from BT about our bill are spam & won't take any notice of us telling it they are not

Should we uninstall McAfee if we install alternative(s)?
At the moment we're intending to see how long before McAfee stop letting us update and then change.
Thanks for all the ideas.