Ok. Im not compeltely certain because you didnt give all the details but my guess is that you didnt delete the scene roots.

Every RTW model must have ONE scene root and it can only have one scene root. It sounds to me that although you deleted the meshes that you didnt want, you forgot to delete the new scene roots that were also imported with every new model. So check back and make sure there is only one scene root and also make sure that there is only one set of bones. Delete any extra scene roots and bones and then make sure that all the bones are attached correctly to the other bones and scene root and then make sure that all the meshes are reattached appropriatly to their corresponding bones.