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Yah hard disk is the best way to go if you think someone will have the time and money to go and send your disk to find traces of what you may have left behind on your hard drive but if your sister doesn't have special software or equipment to look into your hard drive then i wouldn't worry about it.
Just destroy your old partition and format the hard drive after recreating a new partition. Then reinstall Windows and you should be fine or just install Linux as it's a different format system and will make it harder for people to find what you had in Windows.
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