I setup Vista to dual boot with XP. The Vista install program handled everything for more.

>No, Virtual PC is different... You run a machine inside your machine. For example, on your Win2003 machine you could have another window that is running Vista.
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>I haven't done any dual booting with the newer OS'es, but with XP and 2K you needed to modify the boot.ini file to be able to select the OS on startup.