If you have Windows Vista installed and have installed Windows 7 in another partition using a clean install, the Windows 7 bootloader will automatically add an entry for Windows Vista. By any chance, if you have managed to screw this up and want to add the Windows Vista boot option to Windows 7′s bootloader, just follow these steps.
Assuming that you installed Windows 7 on C: and Windows Vista was installed on D:
To Add Windows Vista Boot Option to Windows 7 Boot Menu
Open Command Prompt as an administrator or an elevated prompt and type
C:>bcdedit
This will list the current boot manager configuration. Note down the identifier key which is in the format
{e96c8447-8171-11de-9007-b10454ebd432} or something like it.
C:>bcdedit /copy {current} /d “Windows Vista”
This will copy the current bootloader into a new entry for Windows Vista. However selecting it will still boot into Windows 7.
C:>bcdedit /set {e96c8447-8171-11de-9007-b10454ebd432} device partition=D:
C:>bcdedit /set {e96c8447-8171-11de-9007-b10454ebd432} osdevice partition=D:
These two commands will set the new boot entry to point to your Vista partition and load from it.
You can reboot and see the changes. You can also Run > MSCONFIG and check out the entries in the Boot tab.
Check out this tutorial to see How To Add Windows XP to Windows 7 Boot Menu
As Manan pointed out, You can also use EasyBCD to edit and manage your bootloader entries using a GUI.
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