Fixing Authm.CHM Issues - How to Download and Repair

Last Updated: 09/16/2018
[Time Required for Reading: 3.5 minutes]

Authm.CHM uses the CHM file extension, which is more specifically known as a Compiled HTML Help file. It is classified as a CHM (Compiled HTML Help) file, created for Windows 8 by Microsoft.

Authm.CHM was first developed on 11/08/2006 in the Windows Vista Operating System for Windows Vista. The newest file release date for Windows 8 was 08/01/2012 [version 8]. Authm.CHM is packaged with Windows 8, Windows 7, and Windows Vista.

Please continue reading to find your correct authm.CHM file version download (free), detailed file information, and CHM file troubleshooting instructions.

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File Overview

General Information
File Name: authm.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 8
Developer: Microsoft
Software: Windows
Software Version: 8
File Details
Language Code: English (U.S.)

What are authm.CHM Error Messages?

General authm.CHM Runtime Errors

Authm.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 authm.CHM runtime errors:

Microsoft Visual C++ Runtime Library

Runtime Error!

Program: C:\Windows\Help\mui\0409\authm.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 authm.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, authm.CHM file corruption could be caused from a power outage when loading Windows, system crash while loading or saving authm.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 authm.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 authm.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 authm.CHM error, please proceed to the Step 2 below.

Step 2: Run SFC (System File Checker) to restore the corrupt or missing authm.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 authm.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 authm.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 authm.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 authm.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 authm.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 authm.CHM file version. We maintain a comprehensive database of 100% malware-free authm.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 authm.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 8: C:\Windows\Help\mui\0409\
    Windows 7: C:\Windows\Help\mui\0409\
    Windows Vista: C:\Windows\Help\mui\0409\
  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 8.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve authm.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 authm.CHM Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying authm.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 authm.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 8
Windows 7
Windows Vista

Files Related to authm.CHM

CHM Files Related to authm.CHM

File Name Description Software Program (Version) File Size (bytes) File Location
pmc.CHM Compiled HTML Help Windows Vista 57355 C:\Windows\Help\mui\0409\
usercpl.chm Compiled HTML Help Windows XP 30284 C:\WINDOWS\Help\
regopt.chm Compiled HTML Help Windows XP 24567 C:\WINDOWS\Help\
sendcmsg.chm Compiled HTML Help Windows XP 18379 C:\WINDOWS\Help\
applocker_help.CHM Compiled HTML Help Windows 7 46942 C:\Windows\Help\mui\0409\

Other Files Related to authm.CHM

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igd10umd32.dll Dynamic Link Library Windows 8 4338688 C:\Windows\System32\DriverStore\FileRepository\...
pen_m.cur Windows Cursor Windows 7 1158 C:\Windows\Cursors\
appxsignature.p7x Packed Digital Signature Windows 10 10692 C:\Program Files\WindowsApps\Microsoft.WindowsF...
Policy.14.0.Microsoft.... Configuration Office 2016 904 C:\Windows\assembly\GAC_MSIL\Policy.14.0.Micros...
BthAvrcpTg.sys Bluetooth Audio/Video Remote Control HID Microsoft® Windows® Operating System (6.2.9200.16384) 25856 C:\Windows\System32\drivers\


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