Fix Ntdef.chm Errors and Download Now

Last Updated: 11/25/2023
[Average Read Time: 4.5 minutes]

ntdef.chm is considered a type of Compiled HTML Help file. It is most-commonly used in Windows XP developed by Microsoft. It uses the CHM file extension and is considered a CHM (Compiled HTML Help) file.

ntdef.chm was initially released with Windows XP on 10/25/2001 for the Windows XP Operating System. This file version is latest update offered from Microsoft, according to our records.

In this short article, you will discover detailed file information, steps for troubleshooting CHM file problems with ntdef.chm, and list of free downloads for every version that exists in our comprehensive file directory.

File Analysis Provided by Jason Geater (Author)


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File Overview


General Information
File Name: ntdef.chm
File Extension: CHM file extension
File Type: Compiled HTML Help
Description: Compiled HTML Help
MIME Type: application/x-chm
User Popularity Rating:
 
Developer and Software Information
Software Program: Windows XP
Developer: Microsoft
Software: Windows
Software Version: XP
File Details
Language Code: English (U.S.)


What are ntdef.chm Error Messages?


General ntdef.chm Runtime Errors

ntdef.chm file errors often occur during the startup phase of Windows, but can also occur while the program is running. These types CHM errors are also known as “runtime errors” because they occur while Windows is running. Here are some of the most common ntdef.chm runtime errors:

Microsoft Visual C++ Runtime Library

Runtime Error!

Program: C:\WINDOWS\Help\ntdef.chm

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.


Most CHM errors are due to missing or corrupt files. Your ntdef.chm file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Windows), or deleted by a malware infection. Furthermore, ntdef.chm file corruption could be caused from a power outage when loading Windows, system crash while loading or saving ntdef.chm, bad sectors on your storage media (usually your primary hard drive), or malware infection. Thus, it’s critical to make sure your anti-virus is kept up-to-date and scanning regularly.



How to Fix ntdef.chm Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your ntdef.chm issue. These troubleshooting steps are listed in the recommended order of execution.


Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the ntdef.chm error, please proceed to the Step 2 below.

Step 2: Run SFC (System File Checker) to restore the corrupt or missing ntdef.chm file.

System File Checker is a utility included with every Windows version that allows you scan and restore corrupted system files. Use the SFC tool to fix missing or corrupt ntdef.chm files (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "cmd" but DO NOT PRESS "ENTER".
  3. Press and hold "CTRL-Shift" on your keyboard while pressing "ENTER".
  4. You'll be prompted with a permission dialog box.
  5. In the box, click "YES".
  6. You should have a black screen with a blinking cursor.
  7. In that black screen, type "sfc /scannow" and hit "ENTER".
  8. SFC will begin scanning for ntdef.chm issues and any other system file problems.
  9. Follow any on-screen commands to complete the process.

Please be aware that this scan might take a while, so please be patient while it is working.

If this Step 2 fails as well, please proceed to the Step 3 below.

sfc /scannow

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many ntdef.chm error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the ntdef.chm error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.



If Those Steps Fail: Download and Replace Your ntdef.chm File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate ntdef.chm file version. We maintain a comprehensive database of 100% malware-free ntdef.chm files for every applicable version of Windows. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download ntdef.chm Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy the file into the appropriate directory for your Windows version:

  4. Windows XP: C:\WINDOWS\Help\
  5. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows XP.


GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve ntdef.chm problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.



Download ntdef.chm Files (Malware-Tested 100% Clean)


CAUTION : We strongly advise against downloading and copying ntdef.chm to your appropriate Windows system directory. Microsoft typically does not release Windows CHM files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing ntdef.chm and all other CHM files for Windows. An incorrectly installed CHM file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows XP


Files Related to ntdef.chm


CHM Files Related to ntdef.chm

File Name Description Software Program (Version) File Size (bytes) File Location
nofts.chm Compiled HTML Help Windows XP 11562 C:\Windows\System32\winevt\Logs\
odbcjet.chm Compiled HTML Help Windows 8.1 87270 C:\Windows\inf\WmiApRpl\0009\
wshconcepts.chm Compiled HTML Help Windows XP 13307 C:\Windows\System32\winevt\Logs\
mobsync.chm Compiled HTML Help Windows XP 18920 C:\Windows\System32\winevt\Logs\
safer.chm Compiled HTML Help Windows XP 12977 C:\Windows\System32\winevt\Logs\

Other Files Related to ntdef.chm

File Name Description Software Program (Version) File Size (bytes) File Location
WWAN_profile_v1.xsd XML Schema Definition Windows 10 6201 C:\Windows\L2Schemas\
WLANAP_profile_v1.xsd XML Schema Definition Windows 7 7504 C:\Windows\L2Schemas\
LAN_profile_v1.xsd XML Schema Definition Windows Vista 2241 C:\Windows\L2Schemas\
LAN_policy_v1.xsd XML Schema Definition Windows 7 3472 C:\Windows\L2Schemas\
LAN_policy_v1.xsd XML Schema Definition Windows 8 3472 C:\Windows\L2Schemas\


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