Excuse what may be a simple question, but what are the differences between these programs? Are they trying to do the same thing? I've tried Prevx2 and liked it although I did remove it after a month as things seemed to be slowing down. Maybe it was a combination of things but as Prevx was last one in it was first one out. I'm now intrigued by the new version of Threatfire. Not sure I need it but it may be a suitable replacement for CounterSpy (paid for) when my subscription runs out - or am I way off the ball with this swap?