"Requirements to Dual Boot Windows XP. The different OSs need to be loaded on their own hard drive partition. So you must decided ahead of time where to load Windows XP, and make a hard drive partition if none exist. Then, when the XP install program asks for the load directory, you must specify a directory on the partition/logical drive where you want to load XP.
Note: Your current version of Windows is probably loaded in the directory C:Windows. So Windows XP cannot be loaded anywhere on the C: drive or it will replace your current version of Windows. You need to specify a different drive or partition, e.g. D:, in order to load Windows XP in a dual boot configuration.
The dual boot install would allow having Windows XP and Windows Me on the same computer, allowing the choice to run either Windows Me or Windows XP when the computer boots up. This completely eliminated any problems with drivers as Windows Me and all my software was still available any time I wanted to boot into it.
Another advantage of installing Windows XP in a dual boot mode is it is a "clean install" of Windows XP rather than another write-over of your current version of Windows. This is especially nice if you know you have an unstable version of Windows, as Windows XP will probably not be able to overwrite an unstable installation of Windows."
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http://support.microsoft.com/defaul … px?scid=kb;en-us;306559&sd=tech