how do you dual boot xp and vista on ifl90?

I want to dual boot vista business 64 bit and xp so that i can have vista and stil use all of my old products that are xp only. I have copies of vista and xp too.

 

Here is a guide if you install Vista first: http://apcmag.com/5485/dualbooting_vista_and_xp

Here is a guide if you install XP first: http://apcmag.com/5023/dual_booting_xp_with_vista

Personally, I think it's fairly simple. If you haven't installed either operating system, and you only have one hard drive, your best bet would probably be to install Windows XP first, creating two partitions in the partition manager during setup, either of equal size or giving slightly more room to Vista. After you finish installing XP to one partition, install Vista to the other partition you created. Vista installs its own bootloader which will detect the XP partition and include it as an option when you start-up. That seems like the simplest way of going about it, but you may want to follow the guides for the step-by-step procedures.