Repairs critical disk structures. The following commands are supported: /FixMbr - writes the master boot record of the system ...

Repairs critical disk structures. The following commands are supported:  /FixMbr -- writes the master boot record of the system partition using the master boot record compatible with Windows Vista.  This operation does not overwrite the existing partition table.  /FixBoot -- write a new boot sector onto the system partition using the boot sector compatible with Windows Vista.  /ScanOs -- scan all disks for installations compatible with Windows Vista and display the entries that are currently not in the boot configuration store.  /RebuildBcd -- scan all disks for installations compatible with Windows Vista and allow the user to choose which to add to the boot configuration store.