How to reinstall ntvdm.exe

Written by amanda rumble
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The file "NTVDM.exe" is the Windows NT Virtual DOS Machine, which is responsible for running 16-bit tasks on 32-bit operating systems, including Microsoft Windows NT, 2000, XP, Vista and 7. It emulates MS-DOS to allow the programs based on it to run correctly. If the file becomes corrupted, most likely by a virus or malware, you may need to reinstall it by using the Windows XP installation CD.

Skill level:
Moderate

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Instructions

  1. 1

    Insert your Windows installation CD in the appropriate drive.

  2. 2

    Open the search feature by clicking "Start" > "Search."

  3. 3

    Specify the directory to search in by selecting your CD drive, which is "D:" by default. Search for "NTVDM.EX_," "NTVDMD.DL_" and "EXPAND.EXE" on the disk.

  4. 4

    Copy the three files to your hard drive. Click "Start" and type "cmd" into the "Run" box. Click "OK."

  5. 5

    Type "expand ntvdm.ex_ ntvdm.exe" into the command prompt and press "Enter." Type "expand ntvdmd.dl_ ntvdmd.dll" and press "Enter." Close the command prompt.

  6. 6

    Copy the expanded files into the "C:\Windows\System32" folder. If Windows prompts you to replace the current files, click "Yes."

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