nbsp;   * Find the hidden files ntldr and ntdetect.com in the root of your Vista drive and copy them to the root of your XP drive.
    * If you can’t find the files there, you can find them in the \i386\ folder on your XP install cd

There’s more information on this forum thread, thanks to nrv1013

This is a critical piece of information: Windows XP will be installed on the D: drive, even in Windows XP… so you’ll need to keep that in mind when tweaking your system.

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You can share information between the drives, but I wouldn’t recommend messing with the other operating system’s partition too much… it might get angry and bite you. Or screw up your files. What I do recommend is that you store most of your files on a third drive shared between the operating systems… you could call that partition “Data”.