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ntvdm

About this tag
NTVDM (NT Virtual DOS Machine) is a Windows subsystem that allows 16-bit MS-DOS applications to run on 32-bit versions of Windows. On WindowsForum.com, users frequently report encountering the error 'The NTVDM CPU has encountered an illegal instruction' when trying to run older programs or encountering malware. Common scenarios include launching Internet Explorer 10 on Windows 8, running legacy software like CABWeb, or seeing persistent pop-ups on startup. Some users also notice NTVDM.exe consuming high CPU usage in Task Manager, which can indicate a problematic 16-bit process or infection. Troubleshooting steps discussed include closing the application, scanning for malware, and disabling NTVDM if not needed.
  1. A

    Windows 8 Cannot run internet explorer 10

    I'm using Win8 pro. Due to unknown circumstances the regular start icon for IE has disappeared from the desktop. I found it in all programs, but when I try to run it I get the following: The NTVDM CPU has encountered ab illegal instruction than a numeric code. Close to terminate the application...
    • ameneses54
    • Thread
    • application issues application launch desktop icons error message internet explorer ntvdm reinstall software issues troubleshooting windows 8
    • Replies: 1
    • Forum: Windows Software
  2. bourbonman

    Windows 7 Help with this message Please

    16 Bit MS-DOS Subsystem C\Program Files\CABWeb\CABWeb.exe The NTVDM CPU has encountered an illegal instruction CS:059f IP:020a OP:63 63 65 73 73 Choose 'Close" to terminate the application
    • bourbonman
    • Thread
    • application close cpu dos error help illegal instruction ntvdm subsystem
    • Replies: 3
    • Forum: Windows Software
  3. T

    Windows 7 Help: NTVDM CPU illegal instruction

    Hey guys, I need some help, it's urgent I have this crazy error non stop on my display it says: C:\OPTION-1\4B6F72-1\146.exe The NTVDM CPU has encountered an illegal instruction. Does anybody know how to solve this, please?? Link Removed
    • TheOne
    • Thread
    • cpu display error help illegal instruction ntvdm software troubleshooting windows windows forum
    • Replies: 1
    • Forum: Windows Help and Support
  4. T

    Windows 7 ntvdm cpu illegal instruction

    Hey guys, I need some help, it's urgent I have this crazy error non stop on my display it says: C:\OPTION-1\4B6F72-1\146.exe The NTVDM CPU has encountered an illegal instruction. Does anybody know how to solve this, please?? Link Removed
  5. M

    Windows 7 Windows 7 Processes

    On starting my computer this morning I have noticed the CPU cooling fans running a little harder than I'm used to hearing when just using Firefox. On looking at the task manager I have noticed that rather than sitting at the normal 0% CPU usage when idle a process labelled NTVDM.exe is...
    • magiccottage
    • Thread
    • cooling cpu usage idle ntvdm performance process system resources task manager troubleshooting windows 7
    • Replies: 5
    • Forum: Windows Help and Support
  6. T

    Windows 7 NTVDM CPU illegal operation pop up

    When i start up my acer netbook, I get about five pop up messages that say The NTVDM CPU has encountered an illegal operation and the options 'close' or 'terminate' however if you click on either the message just pops back up again. Can anyone help?
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