Be more specific please. Two possible causes and just as much solutions are offered in that thread. What are you trying to do exactly? Here, I'll make the thing more accessible: I won't be able to guide you through BSA unpacking or NifSkope editing, but if that's what you want to do and you state it clearly I'm sure someone else will jump in to point you in the right direction, or edit the meshes for you. The drive switching thing? I guess if you have a virtual disc drive that's mapped to D change it to something else. Or, disable it completely. The letter itself could be specific to that one member, but it's something to consider.