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Error Message: STOP: C0000221 Unknown Hard Error or STOP: C0000221 STATUS_IMAGE_CHECKSUM_MISMATCH

This article was previously published under Q101096
The following STOP message appears when a critical system file or otherfile needed to load Windows is corrupted:
STOP: C0000221 unknown hard error
<path>\<file name>
Alternatively, the error may read as follows:
STOP: 0xC0000221 unknown hard error
c:\winnt\system32\ntdll.dll (or other specific file/driver)
In Windows 2000 the error reads as follows:
<path>\<file name>
This error can appear in many different formats, ranging from a bluesystem error screen to a dialog box. The type of format depends on howmuch of the operating system was loaded when the corrupted file wasdetected.
If you receive this error message, the file listed in theerror message is corrupted.
To resolve this issue, you need to either obtain a new copy of the fileor reinstall Windows. If reinstallation fails to solve the problem, a hardware or network problem may exist.
The files that are checked for integrity when Windows starts are:
  • All drivers (except those loaded by the system loader to boot the system)
  • All dynamic link libraries (DLLs), including USER, GDI, SHELL, KERNEL, NTDLL, CRTDLL, etc.
  • All DLLs loaded into the address space of the Windows server (video drivers, printer drivers, etc.)
This error message can be caused when you install an inappropriate driverfor your hardware. For example, this error would appear if you installed aMIPS driver on an X86-based computer.
prodnt checksum blue trap

Article ID: 101096 - Last Review: 02/20/2007 00:20:00 - Revision: 2.2

  • Microsoft Windows 2000 Server
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