The most general case is you’ve broken something and this error popped up. The other major cause for this problem is when you’ve installed an older version of Windows like XP on the same PC, that has already Windows 7 installed. This wipes out the boot loader and you need to re-install it.
Boot from the Windows 7 Installation DVD
- Change your BIOS settings to boot from CD/DVD and boot off the install disc. Click through until you see “Repair your computer” link in the lower left hand corner.
- Select the correct installation of Windows (if you’re multiple booting Windows or have more than 1 Windows installed) and click the Next button.
- There you’ll get the System Recovery Options, where you find the option of going to “Command Prompt”.
Repairing the Master Boot Record
- To restore the master boot record, you can simply type in the following command.
- To write a new boot sector onto the system partition use this command. (more helpful)
- To see the remaining options for the base command, you need to type
Replacing Windows XP Boot loader with Windows 7
If you installed Windows 7 first and installed XP next, you’ll find that you can’t boot into Windows 7 anymore. You can use the following commands to restore the Windows 7 boot loader.
Then re-boot. This will replace the XP boot loader and you can boot into Windows 7 again. This will also remove the dreaded “BOOTMGR is missing” message.
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