Took Marks recomendation re-spybot several months ago and it is doing a fantastic job and does it quickly, eficiently and without interfearing with anything else. All for free. Same goes with AVG for anti virus. Makes Norton seem like an interfearing busy boddy that just loves to throw spanners in the works!! What does WinPatrol do Mark that the others dont do? If it is necessary then I will go for it based on your previous recomendations. Is the $20 version essential?