Troubleshooting Def.ini: How To Guide (Free Download)

Last Updated: 06/03/2020
[Reading Time Required: 3.5 minutes]

The development of Avast Internet Security 19.6.2383 by Avast Software prompted the latest creation of def.ini. It is also known as a Windows Initialization file (file extension INI), which is classified as a type of Settings (Windows Initialization) file.

Def.ini was first released in the Windows 10 Operating System on 09/20/2019 with AVG Antivirus 19.8.3108. On 06/28/2019, version 19.6.2383 was released for Avast Internet Security 19.6.2383.

In this short article, you will discover detailed file information, steps for troubleshooting INI file problems with def.ini, 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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Compatible with Windows 10, 8, 7, Vista, XP and 2000

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File Overview

General Information
File Name: def.ini
File Extension: INI file extension
File Type: Settings
Description: Windows Initialization
User Popularity Rating:
Developer and Software Information
Software Program: Avast Internet Security 19.6.2383
Developer: Avast Software
Software: Avast Internet Security
Software Version: 19.6.2383
File Details
File Size (Bytes): 9871
Oldest File Date: 09/30/2019
Latest File Date: 10/30/2019

What are def.ini Error Messages?

General def.ini Runtime Errors

Def.ini file errors often occur during the startup phase of Avast Internet Security, but can also occur while the program is running. These types INI errors are also known as “runtime errors” because they occur while Avast Internet Security is running. Here are some of the most common def.ini runtime errors:

Microsoft Visual C++ Runtime Library

Runtime Error!

Program: C:\Program Files\AVAST Software\Avast\defs\19102900\def.ini

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

Most INI errors are due to missing or corrupt files. Your def.ini file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Avast Internet Security), or deleted by a malware infection. Furthermore, def.ini file corruption could be caused from a power outage when loading Avast Internet Security, system crash while loading or saving def.ini, 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 def.ini 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 def.ini 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 def.ini error, please proceed to the Step 2 below.

Step 2: If recently installed Avast Internet Security (or related software), uninstall then try reinstalling Avast Internet Security software.

You can uninstall Avast Internet Security software by following these instructions (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "Uninstall" and press "ENTER".
  3. In the search results, find and click "Add or Remove Programs"
  4. Find the entry for Avast Internet Security 19.6.2383 and click "Uninstall"
  5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Avast Internet Security software.

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

Avast Internet Security 19.6.2383

Avast Software

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 def.ini 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 def.ini 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 def.ini 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 def.ini file version. We maintain a comprehensive database of 100% malware-free def.ini files for every applicable version of Avast Internet Security. 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 def.ini Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy this file to the appropriate Avast Internet Security folder location:
    Windows 10: C:\Program Files\AVAST Software\Avast\defs\19092903\
    Windows 10: C:\Program Files\AVAST Software\Avast\defs\19093002\
    Windows 10: C:\Program Files (x86)\AVG\Antivirus\defs\19102202\
    Windows 10: C:\Program Files\AVAST Software\Avast\defs\19102900\
    Windows 10: C:\Program Files\AVG\Antivirus\defs\19092903\
    Show 1 more directory +
    Windows 10: C:\Program Files\AVG\Antivirus\defs\19093002\
  4. 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 10.

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

CAUTION : We strongly advise against downloading and copying def.ini to your appropriate Windows system directory. Avast Software typically does not release Avast Internet Security INI 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 def.ini and all other INI files for Avast Internet Security. An incorrectly installed INI file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10

Files Related to def.ini

INI Files Related to def.ini

File Name Description Software Program (Version) File Size (bytes) File Location
Offers.ini Windows Initialization Avast Internet Security 19.6.2383 1226 C:\Program Files\AVAST Software\Avast\setup\
Appraiser_Data.ini Windows Initialization Avast Internet Security 19.6.2383 121956 C:\$WINDOWS.~BT\Sources\Panther\
tuneupcfg.ini Windows Initialization Avast Internet Security 19.6.2383 92 C:\ProgramData\AVAST Software\Avast\
SecurityProductInforma... Windows Initialization Avast Internet Security 19.6.2383 204 C:\Program Files\AVAST Software\Avast\
PerfStringBackup.INI Windows Initialization Avast Internet Security 19.6.2383 1339970 C:\Windows\System32\

Other Files Related to def.ini

File Name Description Software Program (Version) File Size (bytes) File Location
setuperr.log Log Avast Internet Security 19.6.2383 23531 C:\Windows\Logs\DPX\
symbol.ttf TrueType Font Avast Internet Security 19.6.2383 70128 C:\Program Files\WindowsApps\Microsoft.Office.O...
setupact.log Log Avast Antivirus 19.8.2393 1400281 C:\Windows\Logs\DPX\
setupact.log Log Avast Internet Security 19.6.2383 217139 C:\Windows\Logs\DPX\
ts_generic.PNF Precompiled INF Avast Antivirus 19.8.2393 9068 C:\Windows\inf\


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