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Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.
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If something already written to the drive, then a pro will most likely be needed.
If your "reformat" was in fact zero-ing the drive, then no application or pro will be able to retrieve your data.
Good luck!