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I don't know what you're dealing with, but to answer part of your question, if the computer has a restore partition, that will usually wipe the disk and restore everything to its factory condition without you having to do any kind of prep. (Of course you need to back up anything you want.... there are still ways to get the files off, if you need to, even if Windows won't boot--as long as you're not dealing with actual physical failure of the drive.)
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