You can make yourself administrator of your computer and add a guest log-in - very easy to do on XP. As administrator you will have a log in password... on a guest account you wouldn't need one. That way all of your files will be safe and you don't have to hide anything.. : )

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A blessed thing it is for any man or woman to have a friend, one human soul whom we can trust utterly, who knows the best and worst of us, and who loves us in spite of all our faults.