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How safe are keyloggers?

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Hello there,
I have a thirteen year old cousin who is a little know-it-all. I am concerned that she is talking to the wrong kind of people on some sites: a social site or a social site or even AIM. She is extremely gorgeous and looks much older. I am afraid that she might think she can trust somebody and that somebody might lead her to...well I don't think I have to explain my concern. How safe are keyloggers? WIll they affect the computer they are installed in? Will the person find out? (I want her to trust me and not push her away). And can I easily uninstall them? I appreciate this guys, and so will her dad (no Mom).