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
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
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.
Enterprise Mobility and BYOD For Dummies

Like “For Dummies” books, you can read this in whatever order you choose and learn about mobility and BYOD; and how to put a competitive mobile infrastructure in place. Developed for SMBs and large enterprises alike, you will find helpful use cases, planning, and implementation.


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.
LVL 35

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.
I will leave the following recommendation for this question in the Cleanup topic area:

{PAQ : No Refund}

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

EE Cleanup Volunteer

Accepted Solution

Computer101 earned 0 total points
ID: 15697928
PAQed with no points refunded (of 125)

EE Admin

Featured Post

Optimize your web performance

What's in the eBook?
- Full list of reasons for poor performance
- Ultimate measures to speed things up
- Primary web monitoring types
- KPIs you should be monitoring in order to increase your ROI

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

NTFS file system has been developed by Microsoft that is widely used by Windows NT operating system and its advanced versions. It is the mostly used over FAT file system as it provides superior features like reliability, security, storage, efficienc…
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question