The ntdll.dll error appears when ntdll.dll file gets missing or corrupt or damaged from their actual place. Generally the ntdll.dll file is located in c:\windows\system32. If you are using very old versions of Windows such as Windows XP then you will find this file in the c:\i386 directory.
The ntdll.dll file is one of the important dynamic link library file (DLL) of any Windows system, it is referred to as the "NT Layer DLL", contains very important functions to the Windows kernel. We can say that it is one of the core components of Windows system.
There are several reasons that can trigger ntdll.dll error, few of them are:
System hard drive errors
Computer virus or malware infection
When the program which need to access the ntdll.dll gone corrupted or is mis-configured
The ntdll.dll file misplaced form their actual place
A corrupt user account
Common ntdll.dll error messages:
STOP: 0xC0000221 unknown hard error C:\Winnt\System32\Ntdll.dll
STOP: C0000221 unknown hard error \SystemRoot\System32\ntdll.dll
AppName: [PROGRAM NAME] ModName: ntdll.dll
[PROGRAM NAME] caused a fault in module NTDLL.DLL at [ANY ADDRESS]
Crash caused in ntdll.dll!
Unhandled exception at [ANY ADDRESS] (NTDLL.DLL)
If you are surfing from this error then you don’t need to worry as you can easily deal with this issue with the help of below given solutions. All the solutions are will explained and in detail, follow then carefully to resolve all of these problems.
Restart the system: Sometime operating system becomes unable to access the Ntdll.dll file even the file is at their correct place. This happens due to any internal issue, in order to verify this issue simply restarts your computer or laptop and you will see that this one-time error gets fixed.
Reinstall the contaminated app: If you are facing this dll error message when accessing a specific program then you should reinstall the program to fix this problem.
Verify the service package level that is Executing from Windows, and also verify the site support as service packs have been known to cause this error.
Download, install and run an anti malware tool to scan the computer for any kind of malware and viruses.
Turn off some of the Internet Explorer add-ons. If Ntdll.dll error appears while starting the Internet Explorer, running or closing then there is an issue with an add-on. It is suggested to disable each of the add-on, one by one and check for the issue after disabling each of the add-on. Through this you can find out the problematic addon and after it remove them.