AutoCAD Civil 3D

[#1]

the ribbon does not have any tabs or panels currently loaded.

[#2]

OPTIONS, Files tab, make sure your main CUI is set properly to the civil.cuix.

If required, reset that CUI.

[#3]

I think typing RIBBON at the command line will bring it in.

[#4]

If the above methods fail, try to reset your user settings. Steps in the link below:
http://beingcivil.typepad.com/my_weblog/2012/06/add-reset-user-settings-in-civil-3d-2013.html

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