When launching Civil 3D you receive a message similar to this:
Autodesk has provided several solutions to resolve this. . .
1. Uninstall the AutoCAD 2017.1 update
2. Install the AutoCAD 2017 SP1.1
3. Uninstall the Bridge Module
If you choose this option, simply go into your Control Panel and find the Autodesk Bridge Module, right click, and select "Uninstall":