Another good one is Ad Aware. It's freeware from www.lavasoftusa.com. It hunts down and gets rid of spyware, data miners, and other little programs that websites secretly place in your computer when you visit them. You want to get rid of these things because they monitor your computer usage and report it to whomever placed it on your machine. (I.e., the credit card numbers you use, your Social Security Number, websites visited, etc.)

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"The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts." -- Bertrand Russell