dual boot XP with preinstalled vista

How to dual boot Vista and XP (with Vista installed first)? Need best way with step-by-step guide.
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There is this application for doint it: http://www.vistabootpro.org/

Hwr, in order to keep your MBR intact do the following:
Have 2 partitions, a C: and a D: for example, then on the C: installation you should have XP installed, on the other free partition, right click it and set as primary partition, reboot and install Vista, since this partition will now be C:, after you install all your applications etc, then right click where you have XP installed and set as primary, now you can boot with XP or Vista as an only OS on your computer.
The main benefit is that if you want to get rid of any of them, set the other as active partition, reboot and delete the other partition... for this you don't have to reinstall both in case something goes wrong...
Hope this helps.

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