The only reason I haven't tried McAfee is because I bought a disc two years ago which is now not any good but it never worked on my computer. Can you tell me please folks. I am running this bitefinder as a trial for 20 days more. Do I have to take this off my computer before I download the other things. Many thanks all your help is appreciated. What I can't understand is why a virus checker doesn't always pick up on infected emails as they enter the computer.