All I know is how to create a dual-boot installation with Windows 98 SE and Windows XP. First you install Windows 98, on a secondary partition or second HD, then Windows XP on primary partition or primary HD, assuming of course that you intend to use Windows XP primarily and not the other way around. After Windows 98 is installed, Windows XP automatically detects Windows 98 while being installed and sets up the dual-boot menu.
Of course you can also install Windows 98 retrospectively beside the already installed Windows XP, but then to modify the boot menu and Windows XP for correct functioning requires some little more complex work, including the use of a program debug.exe (with which you are better careful if you don't know what you're doing :P).
Maybe this works the same with Vista and XP, too. All you would need is to delete Windows Vista and install XP first, then Vista. No guarantees that Vista will create dual-boot with XP, though, so it's risky. And how to install Windows XP retrospectively I can't really tell you, sorry.
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