Speaking of kids, Microsoft has a very useful program that can make the default accounts settings much more robust. It's called SteadyState. I really think you should check it out if children or guests are a concern when it comes to the computer.

Here's the link
http://www.microsoft.com/windows/pro...s/default.mspx

And here's a more detailed explanation about it...
Screenshot Tour: Kid-Proof Your PC with SteadyState

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