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Are you able to boot the computer?
What version of Windows is on the computer?
The reason for the error is a failing hard drive. The error is usually related to the boot sector being corrupt. But you may be able to repair it.
To get to the point where you can issue commands to fix it, please do the following:
Once you are there, let me know.
Ok... I will give you some commands to try once you are there.
Here are the commands I would run to attempt the repair. Each one starts with bootrec.exe then the "/"
The Bootrec.exe tool supports the following options. Use the option that's appropriate for your situation.
This option writes a Windows 7 or Windows Vista-compatible MBR to the system partition. It does not overwrite the existing partition table. Use this option when you must resolve MBR corruption issues, or when you have to remove nonstandard code from the MBR.
This option writes a new boot sector to the system partition by using a boot sector that's compatible with Windows Vista or Windows 7. Use this option if one of the following conditions is true:
This option scans all disks for installations that are compatible with Windows Vista or Windows 7. It also displays the entries that are currently not in the BCD store. Use this option when there are Windows Vista or Windows 7 installations that the Boot Manager menu does not list.
This option scans all disks for installations that are compatible with Windows Vista or Windows 7. Additionally, it lets you select the installations that you want to add to the BCD store. Use this option when you must completely rebuild the BCD store.