Assuming you don't have any other Autodesk software installed which would need extensive reconfiguration, you could follow the steps outlined at Autodesk Support, specifically from Delete remaining Autodesk product files and folders onwards:
Warning: The following steps instruct you to delete folders at locations that would affect all installed Autodesk products. These
steps assume you have previously uninstalled all Autodesk products and
related peripherals and that it is safe to remove those folders.
In Windows Explorer, locate and delete the installation folder for each Autodesk product that was uninstalled in the previous procedures.
For example:
C:\Program Files\AutoCAD 2015
C:\Program Files\Autodesk\AutoCAD 2016
Delete the following folder:
C:\Program Files\Common Files\Autodesk Shared
Note: These locations may be different if your operating system is configured to store the Program Files folder on a drive other than
C, or if you installed your Autodesk product to another drive and
folder name.
Delete the following user profile folders (substitute your login name for %username%):
Windows 7
C:\Users\%username%\AppData\Roaming\Autodesk
C:\Users\%username%\AppData\Local\Autodesk
C:\Users\Public\Documents\Autodesk
C:\ProgramData\Autodesk
Windows XP
C:\Documents and Settings\%username%\ Application Data\Autodesk
C:\Documents and Settings\%username%\Local Settings\Application Data\Autodesk
C:\Documents and Settings\All Users\Application Data\Autodesk
Windows 7: Depending on your system settings, Windows Explorer may not
automatically display all the subfolders under the Users folder. If
you cannot find these folders, copy and paste the above folder
locations into the Windows Explorer address bar.