These errors can sometimes mean that a piece of hardware in your computer is malfunctioning, but this is rare.
Ntdll.dll Errors
There are many different ways these errors might be displayed on your computer. They can be caused by a number of different things which result in many different error messages, but these are some of the most common:
STOP: 0xC0000221 unknown hard error C:\Winnt\System32\Ntdll.dllSTOP: C0000221 unknown hard error \SystemRoot\System32\ntdll.dllAppName: [PROGRAM NAME] ModName: ntdll.dll[PROGRAM NAME] caused a fault in module NTDLL.DLL at [ANY ADDRESS]Crash caused in ntdll.dll!NTDLL.DLL Error!Unhandled exception at [ANY ADDRESS] (NTDLL.DLL)
The message might appear before or after a program is used, while a program is running, when Windows is started or shut down, or even during a Windows installation.
How to Fix Ntdll.dll Errors
Need More Help?
If you don’t want to fix this ntdll.dll problem yourself, see How Do I Get My Computer Fixed? for a full list of your support options, plus help with everything along the way like figuring out repair costs, getting your files off, choosing a repair service, and a whole lot more. If the software program has any updates or service packs available, install them, too. The software’s programmers may have identified an issue with the program that caused the DLL error and then issued a patch for it. The easiest way to update your Windows computer with the newest service pack and other patches is to use Windows Update. Follow our guide on How to Check for and Install Windows Updates if you need help. Replace your memory if it fails any of your tests.
