User with full admin rights has installed stand alone versions of Civil 3D 2010 on a couple of 64-bit machines (Windows Vista and Windows 7 mix). He has downloaded Service Pack 2 for Civil 3D (yes, I verified the correct service pack was being download and not the one for Civil 2010). When he attempts to install the service pack he receives a message that states:

"The service pack could not be installed because it is not designed for the version of AutoCAD Civil 3D 2010 that is installed on your computer."

Any ideas? ? ? ?