How do I uninstall Neverwinter Nights on Windows 10?

I installed the game from my diamond edition disc. It refuses to run no matter what I have it set at. Any version of windows, even administrator mode. I was able to uninstall the kingmaker module through add/remove programs, but when I try to do that with the game, it gives me a pop-up saying:

An uninstallation support file could not be installed.

Catastrophic failure

So, what am I supposed to do now? I can't play the game, and I can't remove it from my system. I also can't find an uninstaller in the game's folder. I don't know what else to do here.

Solution 1:

If you need to manually uninstall NEVERWINTER NIGHTS PLATINUM EDITION or NEVERWINTER NIGHTS DIAMOND EDITION, follow these steps:

1. Delete the folder where the game was installed
2. Remove the entry from the start menu
3. Remove the following Windows Registry key using RegEdit (Windows + R => regedit.exe):

MyComputer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C1583439-B034-4881-819C-D52A0587662B}

4. Remove the following Windows Registry key using RegEdit:

MyComputer\HKEY_LOCAL_MACHINE\SOFTWARE\BioWare\NWN\Neverwinter

5. Remove the hidden folder:

C:\Program Files\InstallShield Installation Information\{C1583439-B034-4881-819C-D52A0587662B}

(where C: is the drive on your system with the Program Files folder)

Now the game should be completely uninstalled, without any traces left (except maybe save game files).

Update:
If these do not work, try using CCleaner. This is one of the suggested methods by Microsoft support.