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how do i delete my history for good so my parenst don't see it ever without downloading anything or paying?

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i deleted it from the history thing. but i heard parenst can still acess it even when it's deleted. they have a parental controls on right now and i've been looking up proxy sites. i don't wnat then to know that. i have a windows vista pc. help? can they even see it after it's deleted? how?