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Blocking spyware is complicated by the fact that "spyware-like" activity can be part of legitimate programs. Opera and Eudora can be used without paying any cash... if you agree to allowing some very modest space on your screen to be used for advertising. If you want to get rid of the ads, you just have to pay for the software. A spyware blocker will probably notice the activity. You will then say "That's okay, I know about that one, and want to permit it."