Unknown Hard Error C:\Winnt\System32\Ntdll.dll

Ntdll.dll Error Messages

There are many different ways that ntdll.dll errors may be displayed on your computer. Ntdll.dll errors can be caused by a number of different things which result in many different error messages, but some of the most common are listed below:
"STOP: 0xC0000221 unknown hard error C:\Winnt\System32\Ntdll.dll"
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Ntdll.dll Error Messages