So going off of your last post, Lucy, you did try renaming the Override folder, correct? Short of that, I might also rename the 352NAR.mod file to something different like "352NA.mod" as a temporary thing and then load a save from before going to Nar Shaddaa.
Besides this, have you tried adding "Disable Vertex Buffer Objects=1" and/or "DisableVertexBufferObjects=1" to the [Graphics Options] section of your swkotor2.ini file?
Renaming the module didn't work.
However, renaming the Override folder did- so it's definitely something in it.
I don't know what though.