What are AddOns.ini Error Messages?

General AddOns.ini Runtime Errors

AddOns.ini file errors often occur during the startup phase of ACD/ChemSketch Freeware, but can also occur while the program is running. These types INI errors are also known as “runtime errors” because they occur while ACD/ChemSketch Freeware is running. Here are some of the most common AddOns.ini runtime errors:

• AddOns.ini could not be found.
• AddOns.ini error.
• AddOns.ini failed to load.
• Error loading AddOns.ini.
• Failed to register AddOns.ini / Cannot register AddOns.ini.
• Runtime Error - AddOns.ini.
• The file AddOns.ini is missing or corrupt.

Most INI errors are due to missing or corrupt files. Your AddOns.ini file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with ACD/ChemSketch Freeware), or deleted by a malware infection. Furthermore, AddOns.ini file corruption could be caused from a power outage when loading ACD/ChemSketch Freeware, system crash while loading or saving AddOns.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 AddOns.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 AddOns.ini issue. These troubleshooting steps are listed in the recommended order of execution.

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 AddOns.ini error, please proceed to the Step 2 below.

You can uninstall ACD/ChemSketch Freeware 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 ACD/ChemSketch Freeware 2018.1 and click "Uninstall"
5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall ACD/ChemSketch Freeware software.

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

ACD/ChemSketch Freeware 2018.1

Advanced Chemistry Development

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many AddOns.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 AddOns.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 AddOns.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 AddOns.ini file version. We maintain a comprehensive database of 100% malware-free AddOns.ini files for every applicable version of ACD/ChemSketch Freeware. 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 AddOns.ini Files".
2. Click the appropriate "Download Now" button and download your Windows file version.
3. Copy this file to the appropriate ACD/ChemSketch Freeware folder location:
   
   Windows 10: C:\ProgramData\Advanced Chemistry Development\
   
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.

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