Have you even run into a problem in AutoCAD (or a vertical such as Civil 3D), that you can't figure out such as a drawing behaving strange, commands not acting right, commands not working, or maybe even the whole application just won't launch? One of the first things I would suggest is to have someone new log onto your machine and launch AutoCAD under their Windows profile, essentially creating a new "AutoCAD Windows Profile". If the problem goes away when you do this, then it is probably some error or corruption in your own "AutoCAD Windows Profile". Read more about Reset your AutoCAD Windows Profile
Below is a simple animation of creating a quick profile in Civil 3D. No, this is not a new feature, but there are new Civil 3D users every day - and if you have never seen or used this feature - this may help you out.