How to: Fix Ntdll.dll Error Messages in Windows 10 - ITechBrand.com
In Windows 10, the Ntdll.dll error notice may display at startup or when you run a specific application.
The first thing you should do is reboot your computer and see if the ntdll.dll error has been resolved.
Uninstalling the application that is causing you problems is an excellent solution, so follow the steps in this article.
We also urge that you use a proper repair tool, which you can find along with the other options below.