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brunoantunes

Podes estar com sectores danificados.

Podes tentar recuperar todo o disco usando o comando "chkdsk /f" com o cd do windows.
Podes tambem usar o comando "fixboot" e "fixmbr".

Caso nao resulte nenhum destes método, provavelmente terás de ir com ferramentas de recuperacao, como mencionado pelo rsfgouveia.

Edit:
aqui explica melhor

Citar:FIXBOOT driveName will write a new boot sector partition to the drive you are logged onto while in recovery console.
The fixboot command is supported only on x86-based computers.

FIXMBR devicename will write a new Master Boot Record to the drive you specify.
If you do not specify a drive then it will write a new boot record to the primary partition, where your operating system is, then you will undoubtedly loose the partition tables and therefore access to your files.

You can obtain the device name from the output of the map arc command.