What are tmmon.dll.old Error Messages?

General tmmon.dll.old Runtime Errors

tmmon.dll.old file errors often occur during the startup phase of Trend Micro Antivirus Plus Security, but can also occur while the program is running. These types OLD errors are also known as “runtime errors” because they occur while Trend Micro Antivirus Plus Security is running. Here are some of the most common tmmon.dll.old runtime errors:

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

Most OLD errors are due to missing or corrupt files. Your tmmon.dll.old file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Trend Micro Antivirus Plus Security), or deleted by a malware infection. Furthermore, tmmon.dll.old file corruption could be caused from a power outage when loading Trend Micro Antivirus Plus Security, system crash while loading or saving tmmon.dll.old, 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 tmmon.dll.old 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 tmmon.dll.old 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 tmmon.dll.old error, please proceed to the Step 2 below.

You can uninstall Trend Micro Antivirus Plus 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 Trend Micro Antivirus Plus Security 16 and click "Uninstall"
5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Trend Micro Antivirus Plus Security software.

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

Trend Micro Antivirus Plus Security 16

Trend Micro

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many tmmon.dll.old 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 tmmon.dll.old 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 tmmon.dll.old 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 tmmon.dll.old file version. We maintain a comprehensive database of 100% malware-free tmmon.dll.old files for every applicable version of Trend Micro Antivirus Plus 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 tmmon.dll.old Files".
2. Click the appropriate "Download Now" button and download your Windows file version.
3. Copy this file to the appropriate Trend Micro Antivirus Plus Security folder location:
   
   Windows 10: C:\Program Files\Trend Micro\AMSP\resource\engine\c2t1207959909l1p5889r1o1\2.8.1032\
   Windows 10: C:\Program Files\Trend Micro\AMSP\resource\engine\c2t1207959909l1p5889r1o1\2.8.1022\
   Windows 10: C:\Program Files\Trend Micro\AMSP\resource\engine\c2t1207959909l1p5889r1o1\2.8.1032\
   Windows 10: C:\Program Files\Trend Micro\AMSP\resource\engine\c2t1207959909l1p5889r1o1\2.8.1022\
   Windows 10: C:\Program Files\Trend Micro\AMSP\resource\engine\c2t1207959909l1p5889r1o1\2.8.1032\
   Show 1 more directory +

   Windows 10: C:\Program Files\Trend Micro\AMSP\resource\engine\c2t1207959909l1p5889r1o1\2.8.1022\
   
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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