I've used Norton and McAffee Internet Security packages (anti-virus, firewall, etc).  I definately wasn't happy with Norton as I couldn't configure it to let some of my programs through the firewall and it nagged me mercilously about three months before the subscription became due to re-inlist.  It was like the world's worst spam.

Now I have McAffee which works better.  All my programs are compatible with it.  But it naggs me to buy other McAffee products meaning it now takes the title for world's worst spam from Norton.

So, once this subscription is up I'm gonna be in the market for another program...