Office 2000 requires several fonts by filename. XP not only has those fonts under a different name, it doesn't allow you to change them. To do that, you have to move the file to a different folder, rename it, set it to read only, then move it back. Of course to do that, you have to exit out of the installation for office 2000.
Then, during the installation, office 2000 installs files which XP doesn't recognize until after you exit the installation.
It's pretty damn frustrating.