Windows 7 won't start after you install Windows XP or an earlier version of the Windows operating system in a dual-boot configuration. This occurs because Windows 7 uses a different startup method than Windows XP and earlier versions of Windows do.
You must restore the Windows 7 boot sector and allow dual boot by following these steps:
1. Click Start, click Accessories, right-click the command prompt, and then click Run As Administrator.
2. Restore the Windows 7 boot code by typing the following command at a command prompt: DriveLetter:\boot\Bootsect.exe -NT60 All, where DriveLetter is the actual letter of the drive on which Windows 7 is installed.
3. Allow booting of the earlier operating system by typing the following commands at a command prompt, where DriveLetter is the actual letter of the drive on which Windows 7 is installed:
Windows version." DriveLetter:\Windows\system32\Bcdedit DriveLetter:\Windows\system32\Bcdedit DriveLetter:\Windows\system32\Bcdedit
4. Restart the computer.
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