system
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Along with what Bob has posted above, more cookie info/control can be found at the link below. Also at the link is information on other ways to clean your computer of inneeded files. Most of this is written for basic understanding with step-by-step instructions.
http://72.14.207.104/search?q=cache:5Unub82TA4wJ:scscc.com/jan/Cookies,%2520Temporary%2520Files,%2520Managing%2520Favorites.doc+bad+cookie+list&hl=en&ct=clnk&cd=28