Installing Pre Vista windows after installing Vista

1. To install a previous version of Windows onto a computer running Windows Vista (Post-Beta 2)
With Windows Vista Beta 2 as well as in Windows Vista Build 5456, the only command one needs to run is:
bootsect /NT60 ALL
(Copy bootsect.exe from the boot folder of your Windows Vista DVD and paste it into your Windows XP Windows\system32 folder)
This pulls all Windows operating systems into the Windows Vista boot menu.