dvr 0 Junior Poster

I am looking for a free parental control for win xp for a lady at my work.
I just finished building her new pc and she is looking for a parental control for her kids, to block unwanted sites. is there a good free one or should she just go and by one or is there a way to have XP home block stuff? I don't have kids and never looked for stuff like this before.
thanks in advanced

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