Well this worked for me. The issue here is a simple conflict of file folder names and newer code it appears. I cant believe all these people that have been installing and reinstalling over and over. That is just crazy to reinstall everything and uninstall everything just because a folder has a naming conflict. All you should have to do is go to the following location:
C:\Documents and Settings\All Users\Application Data\Autodesk
Most likely if you have multiple installations of civil 3d, you will see the folder Geospatial Coordinate Systems and then several others with the same name and Temp at the end or Temp2012. Civil 3d 2012 is looking for the folder that does not have the temp2012 at the end, despite having created that folder itelf. This is a simple bug and the programmers need to fix it.
You can take the existing folder named "Geospatial Coordinate Systems" and simply add the word OLD to the end of it. Now, I made a copy of the one that 2012 created (on my computer it was named Geospatial Coordinate System Temp2012). Then i reneamed the copy to what 2012 is looking for: "Geospatial Coordinate Systems". You probably dont need to make the copy but can simply delete the "Temp2012" part, but i retained it. Now it should work for you. I am not sure how that will affect your older versions of cad, but you can at least go in and rename the folders again if you need to use 2010 or 11. At least this way you dont go through the hassle of reinstalling everything and needing to uninstall your previous versions because of a simple folder name conflict that can be fixed in about 45 seconds.
