Estou surpreso que você possa inicializar com os discos fornecidos pelo fabricante. Você verificou as configurações da BIOS para garantir que o seu computador inicializa a partir do CD antes do HD? Muitas máquinas de trabalho são configuradas dessa maneira, para impedir que as pessoas se movimentem.
Ao inicializar, use a opção do sistema de reparo. Se isso não funcionar, você precisará inicializar no console de recuperação do sistema. Para chegar ao console de recuperação, você pode selecionar a opção em reparar meu sistema ou pressionar F10 enquanto estiver na configuração.
Use o seguinte comando para corrigir seu MBR no console de recuperação:
d: \ boot \ bootsect.exe / nt60 todos
Aqui está o link oficial da Microsoft. Eu vou cortar e colar, mas a formatação não vai ser traduzida.
link
You can use the Bootrec.exe tool in the Windows Recovery Environment
(Windows RE) to troubleshoot and repair the following items in Windows
Vista or Windows 7: A master boot record (MBR) A boot sector A Boot
Configuration Data (BCD) store Note When you are troubleshooting
startup issues by using the Windows RE, you should first try the
Startup Repair option in the System Recovery Options dialog box. If
the Startup Repair option does not resolve the issue, or if you must
troubleshoot more steps manually, use the Bootrec.exe tool. Back to
the top MORE INFORMATION To run the Bootrec.exe tool, you must start
Windows RE. To do this, follow these steps: Put the Windows Vista or
Windows 7 installation disc in the disc drive, and then start the
computer. Press a key when you are prompted. Select a language, a
time, a currency, a keyboard or an input method, and then click Next.
Click Repair your computer. Click the operating system that you want
to repair, and then click Next. In the System Recovery Options dialog
box, click Command Prompt. Type Bootrec.exe, and then press ENTER.
Note To start the computer from the Windows Vista or Windows 7 DVD,
the computer must be configured to start from the DVD drive. For more
information about how to configure the computer to start from the DVD
drive, see the documentation that is included with the computer or
contact the computer manufacturer. Back to the top Bootrec.exe options
The Bootrec.exe tool supports the following options. Use the option
that is appropriate for your situation.
Note If rebuilding the BCD does not resolve the startup issue, you can
export and delete the BCD, and then run this option again. By doing
this, you make sure that the BCD is completely rebuilt. To do this,
type the following commands at the Windows RE command prompt: bcdedit
/export C:\BCD_Backup c: cd boot attrib bcd -s -h -r ren c:\boot\bcd
bcd.old bootrec /RebuildBcd /FixMbr The /FixMbr option writes a
Windows 7 or Windows Vista-compatible MBR to the system partition.
This option does not overwrite the existing partition table. Use this
option when you must resolve MBR corruption issues, or when you have
to remove non-standard code from the MBR. /FixBoot The /FixBoot option
writes a new boot sector to the system partition by using a boot
sector that is compatible with Windows Vista or Windows 7. Use this
option if one of the following conditions is true: The boot sector has
been replaced with a non-standard Windows Vista or Windows 7 boot
sector. The boot sector is damaged. An earlier Windows operating
system has been installed after Windows Vista or Windows 7 was
installed. In this scenario, the computer starts by using Windows NT
Loader (NTLDR) instead of Windows Boot Manager (Bootmgr.exe). /ScanOs
The /ScanOs option scans all disks for installations that are
compatible with Windows Vista or Windows 7. Additionally, this option
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. /RebuildBcd The /RebuildBcd
option scans all disks for installations that are compatible with
Windows Vista or Windows 7. Additionally, this option lets you select
the installations that you want to add to the BCD store. Use this
option when you must completely rebuild the BCD.