How Do I Set Up a Dual-Boot Vista System?
There are many reasons to create a dual-boot system, but one common motivator is to try a new operating system before committing to the full upgrade. Since beta and release-candidate versions of new operating systems are not final, many users are unsure about trusting their data to an overwrite. Also, people grow attached to systems they know. If you like XP, for example, rather than give it up, you can run it side by side with Vista or Windows 7.