Fix boot and master boot record XP/Vista

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Most hard drive issues are due to unexpected rebooting or sudent power failure. This, in turn, usually prevents the operating sytem from booting, even if the disk is not actually damaged.

Botting trough an OS install disk, we can open a repair command-line to try some things that may fix the boot system.

In XP/W2K:
fixmbr
fixboot

In Vista/7:
bootrec /fixmbr
bootrec /fixboot

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