Is there any way to block my user agent?

When I look at my IP address I see that my system (WIN XP) and web browser is shown in. Is there any program that can download and use to block or hide the addition of a proxy? Must be completely free! Thanks guys for any help!

This should help: – http://pcsecurityworld.blogspot.com/2006/10/stop-browser-privacy-leak.html

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