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I totally agree with youJust wipe the drive and start fresh.
It's simple enough and there is no reason to start messing around with the registry. I am really surprised the system was sold with the school's windows image, that's kind of a no-no as a former e-steward e-recycler. Schools are usually careful about disposing of their used systems. Anyway I doubt there's much to save, you can always use some key finder software if there's some software you want to attempt to save.