Upon launching Windows Vista Microsoft has, as Microsoft is wont to be doing, discovered a whole new set of headaches and problems for the average techie to overcome. One of these new problems is the sibling rivalry which can exist between Windows XP and Windows Vista, as a lot of people who have tried to have their cake and eat it have discovered.

So, a step-by-step tutorial for dual booting Windows XP and Vista is needed. Well, actually you need two. The first outlines how to do it if you have Windows Vista installed on a machine first. The second outlines how you'd do it with Windows XP installed first. Both useful scenarios, be you having bought a new machine with Vista and want to dual boot XP; or have an existing machine and want to give Vista a goo.