Question about Microsoft Windows XP Home Edition

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16 bit MS DOS Subsystem error

Everytime i start my computer, this message pops out: 16 bit MS-DOS Subsystem

C:\WINDOWS\system32\cmd.exe
The NTVDM CPU has encountered an illegal instruction.
CS:0541 IP:0206 OP:63 68 61 72 73 Choose 'Close' to terminate the application.

i dont know how to fix it and it's really annoying and i fear it can eventually harm my computer..please help me

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I found a website of people who have the same problem;as you will see Microsoft does not have a fix for it. The recommended fix is to backup your data and reload Windows.
http://www.techspot.com/vb/all/windows/t-5039-NTVDM-CPU-illegal-instruction-.html

Pls rate this solution.

Posted on Apr 13, 2009

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Hello there:
Something is amiss with your system.

That error message is associated with problems involving 16 bit
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This sounds like it may be caused by an incomplete removal of one of
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You did not mention the specific products that you have tried. If you
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16-bit ms-dos sub system error while runing graphics programs on ntvdm cpu on amd athlyon processorTurbo c++The NTVDM CPU has encounterd an illegal instructionCS:d3e8 IPc180 OP:ff ff ff ff ff ff


HI,

Navigate to updatemgr.exe in C:\Programs\Common Files. Next, rename the file. Right-click it, select RENAME and rename it to, say, updatemgr.old, save the changes and click on OK. RESTART your computer and the problem should now be solved.


Please post back if you need anymore assistance.

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Turbo c not working....16 bit ms-dos subsystem error


There have been several changes in the way programs work. Windows xp does not
allow direct access to hardware resources to protect system integrity.
However you can try a few things

http://support.microsoft.com/kb/314106
http://support.microsoft.com/?id=165214
http://support.microsoft.com/?id=324767

Generaly speaking this error shows up when a program tries to use a
command.com file from an incompatible version of windows.

Alternatively login in safemode and use. it ll work fine. rate this!!

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16 bit MS-Dos Subsystem Turbo C++ IDE The NTVDM CPU has encountered an illegal instruction cs:0000lp:flboop:of00640352 choose close to terminate the application


I too have a problem on my PC,when running the Turbo C programThe error message is:

16 bit MS Dos Sub system
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At last i found the solution, and it is simple.
After installing your turboC follow the steps..
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When i am trying to use c++ on my system it is giving me message the NTVDM cpu has encountered an illegal operation


Here is an explanation of what NTVDM is: The NT Virtual DOS Machine (a.k.a WOW, or Windows on Windows), is a Win16 subsystem that runs under Windows NT, which allows 16-bit applications to run as if they were being executed on a DOS machine, with that machine's multitasking and segmented memory model. Because the system is multitasked 16-bit DOS and Windows applications cannot crash NT. However, 16-bit apps within a Win16 subsystem run the exact same way as they do on a DOS/Win 3.x machine; therefore, 16-bit apps within the subsystem can crash one another, or the subsystem. To prevent this, you can launch multiple WOW subsystems as long as your program does not communicate using shared memory. Windows NT will not allow NTVDM to execute instructions that try to directly manipulate hardware or memory locations. As a result, some DOS and Windows 3.x applications (such as games) may not run under Windows NT.

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The NTVDM CPU has encountered an illegal instruction


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1 Answer

The ntvdm cpu has encountered an illegal instruction


I took this from another web site:
Michael Chiew said:
What did you do before this happened? What were your last deeds on the machine before the pop-up appeared?

I think what you're referring to is NTVDM CPU, not NTDVM CPU. Am I correct?

What do you know about 16-bit and 32-bit applications? Well, 16-bit applications are those that must work within the DOS (Disk Operating System) environment, a real-mode arena. NTVDM stands for NT Virtual Dos Machine.

In Windows XP, as in Windows 2000, or Windows 98, there are 16-bit and 32-bit environments (real mode and protected mode respectively).

Windows XP can only operate in 32-bit mode. All 16-bit applications must work within its own theatre of operation, typically, the first MB of physical memory (ram). Conversely, 32-bit applications must function above the first MB memory line. If either of these applications happens to slip into "alien" territory, you get an error message like "something" has encounter an illegal instruction. In other words, the wayward application is trying to slip by the immigration checkpoint.

In your case, updatemgr.exe (I suspect updatemgr.exe is a 32-bit application) has in all likelihood wondered into the 16-bit arena. Hence, NTVDM CPU issues that warning. 

Why do you continue to get the message. It's because updatemgr.exe incessantly misbehaves itself on start-up, always trying to load itself into a particular memory address where it is not welcome. Why the persistence? Updatemgr.exe has gone bonkers. It is either corrupted or damaged.

On the other hand, one cannot discount the possibility that NTVDM (NTVDM.EXE) is corrupted or damaged. So your problem lies with either updatemgr.exe or NTVDM.EXE, or both.

There are 2 things you could do.

First, establish who owns updatemgr.exe, Microsoft or some third-party owner. Second, rename updatemgr.exe and see whether the message goes away.

To establish ownership (and the function of updatemgr.exe), do a search for the file. 

Click START, select FIND. In the FIND dialog box, type: updatemgr.exe. See the directory in which the file has lodged. In Windows Explorer, get to the file, right-click on it, select PROPERTIES. Who owns it? Is there an indication of its function.

Next, rename the file. Right-click it, select RENAME and rename it to, say, updatemgr.old. RESTART your computer. Do you still get the error message. Not likely.

To clean things up a bit, perhaps it is a good idea for you to replace the current NTVDM.EXE with a new copy. Find out where NTVDM.EXE is. Then, click START, select RUN. Type in the RUN dialog box SFC to run the System File Checker. Insert your OS CD, follow the prompts, extract a copy of NTVDM.EXE and send it to its place of residence. Of course, you should also replace a copy of updatemgr.exe.

That should eliminate your problem for good.


Dec 25, 2008 | Microsoft Windows XP Home Edition

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