How do i completely wipe my lenovo edge 91z without reinstalling window's 7

I just bought this computer from my cousin but he is acting a little weird. I'm worried he stole it but I payed him $500 hundred. My question is if it is stolen? How do I clean or wipe the hard drive so if they trace or track it, there stuff isn't on it?
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  1. You really expect us to help you with that?

    Definitely not
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