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NTVDM CPU Has Encountered an Illegal Instruction

This article was previously published under Q245184
When you attempt to run a 16-bit program on a computer running Microsoft Windows NT 4.0 Service Pack 3, the program may quit immediately, or you may receive the following error message:
Hidden Console of WOW VDM
The NTVDM CPU has encountered an illegal instruction.
CS: 04c3 IP:3937 OP:c71c 9d 37 00
Choose Close to terminate the application.
When you click Close, you may receive several similar error messages.
This behavior can occur if you use an incorrect version of the file. For example, this issue is known to occur if you use a file included in Microsoft Windows 95, dated 7/11/95.
To resolve this issue, replace the file in the Winnt\System32 folder with the same file from another computer that is running Windows NT Workstation 4.0 or Windows NT Server 4.0, and then make sure that there are no files dated 7/11/95 on the computer. You can also replace the file on the computer with the same file on the Windows NT installation CD-ROM.
NT simulate emulate 95

Article ID: 245184 - Last Review: 11/01/2006 03:30:45 - Revision: 1.1

  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • kbprb KB245184