Hello, Vista BSoD says "Oxc000021 file corrupt, header checksum... STOP ....24." It won't restore (disk error-it also won't fix), recover, or repair. I can't get a black screen to type in commands either.
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Sounds like your HD went south. Get a new one and start from scratch. If there's anything you need off the old drive strap it to the system as a secondary and see if you can access anything.