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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

My operating system is Windows Xp When ever i run C programme below given message appears 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

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

16 bit MS Dos Sub system
turbo c++ IDE the NTVDM has encountered an illegal instruction.

At last i found the solution, and it is simple.
After installing your turboC follow the steps..
1) go to TC directory and open BIN.
2)In "BIN" folder you can find "tc.exe". Right click on "tc.exe" and click properties (and make sure that do not click on shortcut of TC.exe).
3)In properties there should be a tab called "screen", In that you will find "usage" option. There.. select "window" option instead of "full screen".
4) Then click "OK".
5) Now click "TC.exe".
6) It will open in window mode, if you want you can change full screen mode by pressing "ALT + Enter".

Thanks & Regards
Shravan reddy Konnela.

Posted on Dec 11, 2011

  • app_3rp40130
    app_3rp40130 Sep 15, 2012

    where can i find the TC directory ?

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You have to download turbo c v2.01 . which can be got here
http://edn.embarcadero.com/article/20841
to download it you just have to join the developers group

after downloading it extract it . then you will get 3 folders by namedisk1,2,3 . then press install from disk 1 after installation it willask to enter 2 disk. so you cancel the setup and come out of it. thencopy all the files from disk 2 and disk 3 and pate it in c:/tc . whichis already created . enjoy now your tc.exe will work. enjoy . try it 1000% guarantee it will work . because i was also facing the same problem

Posted on Feb 01, 2010

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Try using DOSBox 0.73, it's free. It emulates an x86 processor with DOS. It might work. Otherwise try to get an old CD-ROM based installation disk for MS-DOS and run it in Microsoft Virtual PC
get dosbox at http://www.dosbox.com/
or
dosbox.sorceforge.com

Posted on Jul 16, 2009

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Ntvdm cpu encountered illegal operation Hi all! I just installed Maya 2010 from a torrent file and since then I got this famous error message. It's just appeears as three command prompts appearing at the...


If I am reading this right your issue is not the application but where you obtained the application. Maya 2010 is a modern design application and comes in 32 & 64 bit versions. It is not a 16 bit application.

When Windows encounters a legacy application it calls the NTVDM for the legacy application to run in.

The fact that the application is calling the NTVDM is highly suspicious. NTVDM is the NT Virtual Dos Machine, a way for legacy applications to run in NT environments.

NT environments are Windows NT 3.5, NT 4.0, Windows 2000 Professional, Windows XP (Home, Pro & Media Center Ed), Vista (all versions) and Windows 7.

Old (legacy) applications written for 16 bit date back to Windows 3.1 and include Windows 95, 98 and Millennium Edition.

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http://support.microsoft.com/kb/314106
http://support.microsoft.com/?id=165214
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Alternatively login in safemode and use. it ll work fine. rate this!!

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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


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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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