Tried getting this installed on XP a couple weeks ago after I finally freed up enough space to accommodate it. Source is from the torrent that was originally posted here on BG when the expansion came out, FFXI install is default location and all that, and everything is NA version. Whenever I try to run the installer, it gives me the 'FFXI not installed' error and quits.

I reinstalled windows a few months ago on top of itself, and had backed up my FFXI registry entries prior to doing so. The game runs without giving me any trouble, I double checked to make sure I had re-added the registry entries and everything looked fine. I'm guessing I probably missed a few registry keys or something, anyone know what needs to be in place to get this thing working without a full reinstall?

If it helps narrow anything down, I have backups of the pol and polUS entries.