I get the error message “The NTVDM CPU has encountered an illegal instruction” when I try to open applications and it has something to do with the 16 bit MS-DOS subsystem and rundll32.exe. How can I fix this?
NTVDM Error
Yes. So, it would seem that the first thing you need to do is identify the application that is calling the 16-bit subsystem. Basically what is happening is the file that you are trying to use is attempting to access the computer’s memory, but the configuration won’t allow it.
Using Windows System Configuration Tool
Fortunately there is a Windows utility called System Configuration that can help. This tool helps locate problems related to your XP or other install configuration, as I am assuming this one is. You can open and run this utility, which will offer you choices to narrow your troubleshooting efforts. In the past, many users report success after disabling a file called msupdte.exe or the Microsoft Office Startup Menu. You should be able to delete these from the Windows Auto Launch list without losing access to the programs. Here is a link to the Microsoft Support page that offers a tutorial to deal with configuration errors.
Scan for and Protect Against Spyware
Other than the configuration option and the tool above, this problem is sometimes related to spyware infection. When rogue programs install themselves on your machine they can interfere with normal processes. I suggest you download and run a tool like Spyware Doctor right away to check for errors and consider investing in a subscription program for spyware and adware like XoftSpySE by Paretologic.
Repair your Windows Installation
Since there is a communication error occurring in your operating system - as long as you have already ruled out spyware - you can use a Windows utility to repair the installation, which we hope will repair the error. To do this you will need a Windows operating system CD.
- Put the CD in the disk drive and turn the computer off
- Power it back up and the system should launch from the CD
- At the Welcome to Setup screen, press Enter to setup Windows
- Press F8 to accept the license
- Use your keyboard arrows to choose your installation, then press R to start the repair
- Ignore the prompt to press any key to boot from CD if it appears
- Allow the process to run until completed
- Reboot your computer
- Visit Windows Updates and your security software provider to re-update your programs as recent changes will be lost
Contact a Remote Technical Assistant
If none of these suggestions are effective, you might consider contacting a remote technical assistant. If you get into trying to configure your computer and are stuck, a remote tech will help you step by step in real time, so that you can diagnose and treat the issue. We recommend the services available here. I hope this helps, good luck!
Kate Dubensky | July 13th, 2009
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