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Thinking imonitor power keylogger or spector will be satisfied with your requirement, you can download a free trial and try yourself.
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this i found to be the best way, then it dont matter what browser is used it will remain blocked
http://allthingsmarked.com/2006/08/28/howto-block-websites-using-the-hosts-file/
Anonymous
this is what i used, it really works and comes with screenshots.
http://www.wikihow.com/Block-a-Website-in-Internet-Explorer-7