You could try this:
1. Set your BIOS to use the DVD drive as the primary boot device.
2. Boot with your Windows 7 installation DVD or the Windows Repair CD.
3. Press a key when the message indicating "Press any key to boot from CD or DVD …" appears.
4. Select a language, a time and currency, and a keyboard or input method, and then click Next.
5. Click Repair your computer.
6. In the System Recovery Options dialog box, choose the drive of your Windows installation and click Next.
7. In the System Recovery Options dialog box, click Startup Repair.
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