How to Fix the MBR in Windows Vista
The master boot record (MBR) is a part of the hard drive that tells the computer's operating system how the storage is partitioned and where the boot files are located. The master boot record is the first section on the hard drive. Occasionally, the master boot record becomes corrupted or accidentally deleted. This causes the machine to hang at bootup. Vista has a recovery tool you can use to repair the MBR.
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Instructions
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Insert the Windows installation CD or DVD into the CD/DVD drive of your system. Reboot the computer with the disc still in the drive. This starts the computer at the Windows installation screen.
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Select a language and time for the installation process at the first screen and use the arrow keys on your keyboard to select "Next."
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Press the "R" key to select "Repair your computer" from the next window of options. This brings you to the recovery console in Windows.
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Select "Command Prompt" from the list of options. This brings you to a DOS command shell. Enter "bootrec" (without quotations) into the command prompt. This repairs the MBR on the computer.
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Remove the Windows installation CD or DVD from the disk drive and reboot your machine. The computer should boot into Windows with the MBR repaired.
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