If you get to windows startup repair, would guess the hard drive is okay. If you have the windows 7 CD, or download one, I would try booting into that and choosing repair mode. The start using the bootsec commands (I forget what they all are, but google bootsec nt60), won't touch data or programs but attempt to repair any problems with booting as it will create a whole new mbr.
EDIT: I should include this should be done in the original computer.
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