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.
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Insert your Windows installation CD in the appropriate drive.
Open the search feature by clicking "Start" > "Search."
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.
Copy the three files to your hard drive. Click "Start" and type "cmd" into the "Run" box. Click "OK."
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.
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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