I recently uninstalled Civil 3D 2013 and then immediately reinstalled it. (Why? To "convert" it from a standalone license to a network license - that itself is another conversation......)
Anyway, this was done while logged in as local administrator, with the A/V disabled, etc.
What I found after the user logged back in and fired up C3D is that several files in %appdata%\Autodesk\C3D 2013\enu\Support were missing. Most notably "C3D.dll", "C3D.cuix", and "Civil*". I don't care if the uninstaller removes these files, but shouldn't the installer put them back? This is not the first time I have noticed this. Anyone else?