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ntvdm cpu has encountered an illegal instruction

Posted on 2005-03-03
Medium Priority
Last Modified: 2008-01-09
Receiving this message upon bootup.  We are able to click on a message and login to win2k and continue working without any problems.
Question by:lanebaker
LVL 57

Expert Comment

by:Mike Kline
ID: 13453733
Is there an application associated with the message?

For instance c:\Windows\System32\yourapplication.exe

If there is an application then you can use msconfig


See if that application is listed in the startup application.  You may be able to remove it.

LVL 35

Expert Comment

by:Nirmal Sharma
ID: 13456493
>>>ntvdm cpu has encountered an illegal instruction
Ntvdm is a windows 16-bit programs or process that is used when you run any 16-bit application. NTVDM CPU means NTVDM Structure has been corrupted...you need to repair it using the following: -


The NT Virtual Dos Machine and the Windows On Windows subsystem are used to run older 16 bit software applications. Below are some trouble shooting steps

   1. Check the Autoexec.nt and Config.nt for anything unusual or anything that can be commented out (in the %systemroot%\system32 directory).
   2. Rename Autoexec.bat (e.g. c:\autoexec.bat).
   3. Check for changes in Win.ini or System.ini, or replace by expanding the original files off of the installation media. (%systemroot% directory)
   4. Rename all other *.ini files if possible
   5. In the Config.nt file, allow only:
      dos=high, umb
      shell=%SystemRoot%\system32\command.com /e:4096

If you still have problems checkout Knowledge Base article http://support.microsoft.com/support/kb/articles/q196/4/53.asp which has more information.

These files are also on the Emergency Repair disk so you could just copy the versions from the disk over your existing ones which may fix the problem.

This can also be caused by a virus, for example "NYB" in the boot sector of the machine. (PC has a bootable DOS and a bootable NT partition).

***End Quote***
Ref: -  http://www.windowsitpro.com/Article/ArticleID/14610/14610.html?Ad=1

How to Fix and troubleshoot: -

Let me know.

LVL 35

Expert Comment

by:Nirmal Sharma
ID: 13456497
Please see this too: -

When you get this error ? Its not any startup application i know.
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Author Comment

ID: 13458651
the error does not reference any particular application.  My customer is able to click ignore and proceed to working.  I will try the suggestions posted and get back to you.  Thanks folks.
LVL 35

Expert Comment

by:Nirmal Sharma
ID: 13464501
Yes...you need to worry about the errors...sometimes if the NTVDM module is not loaded properly application and data both may corrupt.

Let me know.
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Expert Comment

by:Nirmal Sharma
ID: 15647481
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.
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