Bec, It's not that you can't use PBooost on your fat32 xp system, it's just that all your MAT pose files and CR2 file must have correct file references in them in order for PBooost to 'follow' where they are. So that if a texture is in a folder called, "mikeTextures" and the MAT file says that the texture is in a folder called, "michaelTextures", the system will lock because of the difference. (This apparently is a Poser4 problem rather than a PBooost problem. It has to do with how and what Poser reads when it's putting together the library menues.) SO, once you have all your MAT files and CR2 and PP2 files corrected (if necessary) everything will work. Hog's Correct Reference (free or pay version) will correct these references and then PBooost should work. I did my reference correction by "hand" with PBooost's deep file editor because the free Correct Reference sometimes miss-corrected references to textures that had the same name - like black.jpg and black.jpg for hair textures that were for different products... Good luck should you try it again. Dave