That's not a lack of memory, run a search in your Poser/Geometries folder for dragon and delete the rsr file. You should find that the Dragon will load. Make sure though that it is the file with extension rsr in your GEOMETRIES folder that you delete. What happens is that poser randomly corrupts rsr files in the geometries directory for reasons known only to itself. When these are corrupted, the object file can't load properly and you get this misleading and incorrect "out of memory" error message. It's one of Poser's little quirks that you'll either learn to love or hate. :)