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If you need data off that disk I recommend taking it out of the laptop and plugging it into a dock, use it like a USB HDD on another device and try to copy anything off.
Otherwise Its format and reinstall Windows time looking at that. Does it have a recovery partition? some manufacturers ship their devices with them others dont. As JonnyK recommended, you can obtain a copy direct from Microsoft using your product key (often on a sticker underneath): http://www.microsoft.com/en-us/software-recovery