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I've seen this problem quite a few times; assuming the hard drive isn't physically damaged (bad sectors, etc.) when part of the MBR or partition table becomes corrupt, things are often no more than a few keystrokes away from being back to normal, without any serious data recovery needed.
Keep the drive plugged into a host computer by USB, and download the Windows version of TestDisk from cgsecurity.org (freeware!) to analyse and restore the partition tables.
Reboot, then run CHKDSK to clean up any other problems left behind on the restored partitions.
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