#1
i've heard of this being done like having XP and vista both on the hard drive then being able to like choose upon startup, but how exactly does one do this?
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#3
make a second partition on the hard drive that already has XP on it, then install vista on that empty partition. you should get a menu every time you start the computer.
#4
sounds complicated haham, and i already have vista installed on here
<Raven> I got so baked last night
<Raven> that I WOKE UP high o_o
<Raven> Do you have any idea how euphoric that is?
<Raven> I felt like I was being born.
#5
vistas Mast boot Record doesn't like xp and if vistas MBR isn't intact it won't work

your best bet is to install xp on a second partition, then install linux on a 3rd, use the GRUB workaround for the vista MBR and there you have 3 operating systems.
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#6
Either a dual boot or a virtual machine.

Dual Boots should allow you to choose which OS you wish to drive upon startup. im far less familiar with these. For example, "Boot Camp."

Virtual machines i have run before however, and its basically running a program window of the second OS on the first OS. for example, "Parallels"

both boot camp parallels and windows version of parallels are gone cost you money if you into doing things legally atleast.
ehh