No need to panic here...
AutoCAD Map/Civil 3D 2014 shipped with some updates to the FDO Providers. Some of those updates were not reflected in the providers.xml file that comes with the program, so when some users run MAPIMPORT or MAPEXPORT, they get a FDO Provider ### Not Registered error message.
The current solution (and it seems to only affect users that have a previous release of Map/Civil 3D installed) is to replace your providers.xml file with the one attached here. Download providers.xml
File is generally located in:
C:\Program Files\Autodesk\Autodesk AutoCAD Map 3D 2014\bin\FDO or
C:\Program Files\Autodesk\Autodesk AutoCAD Civil 3D 2014\bin\FDO
A Hotfix should be posted soon to autodesk.com.