That is free or has a low price.
http://spywareterminator.com is a great free tool for this. and you can search the free downloads at http://www.pcworld.com they have many tested tools to download. good luck.
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The CommandCenter NOC 50 is a Free network monitoring system available at www.commandcenter-noc.com. This explains how to download.
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can provide the source code if anyone is interested. ... diy software technology "tips & tricks" hacking "network security" ...