Microsoft Windows 7 may need to repair the Master Boot Record (MBR) utilized to boot the computer and access the operating system. This issue may occur when another operating system is installed to create a "dual-boot" system. When the MBR becomes corrupt, the user may see the message "Operating System Not Found" when booting up the machine. Microsoft has included a utility named "BootRec" to repair and/or recreate the Master Boot Record.
Instructions
Insert the Windows 7 installation DVD into the DVD drive on the computer.
Reboot the computer and boot from the DVD to enter the Windows Recovery Environment (Windows RE) by pressing any key when prompted.
Select Language, Time Zone, Time and Input Method, and then click "Next."
Click the "Repair Your Computer" option.
Click the radio button next to the operating system to repair and click "Next."
Click "Command Prompt" in the System Recovery Options section.
Type "Bootrec.exe /FixMBR" (without quotes) at the command prompt. Press the Enter key. The Master Boot Record is repaired by the repair utility.
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