What are HosFErr_a.htm Error Messages?

General HosFErr_a.htm Runtime Errors

HosFErr_a.htm 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 HTM 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 HosFErr_a.htm runtime errors:

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

Most HTM errors are due to missing or corrupt files. Your HosFErr_a.htm 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, HosFErr_a.htm file corruption could be caused from a power outage when loading Trend Micro Antivirus Plus Security, system crash while loading or saving HosFErr_a.htm, 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 HosFErr_a.htm 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 HosFErr_a.htm 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 HosFErr_a.htm 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 HosFErr_a.htm 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 HosFErr_a.htm 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 HosFErr_a.htm 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 HosFErr_a.htm file version. We maintain a comprehensive database of 100% malware-free HosFErr_a.htm 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 HosFErr_a.htm 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\backup\20013\
   Windows 10: C:\Program Files\Trend Micro\AMSP\module\20013\6.5.1143\5.0.1051\
   Windows 10: C:\Program Files\Trend Micro\AMSP\module\20013\res\
   Windows 10: C:\Program Files\Trend Micro\AMSP\backup\20013\
   Windows 10: C:\Program Files\Trend Micro\AMSP\module\20013\6.5.1143\5.0.1051\
   Show 5 more directories +

   Windows 10: C:\Program Files\Trend Micro\AMSP\module\20013\res\
   Windows 10: C:\Program Files\Trend Micro\AMSP\backup\20013\
   Windows 10: C:\Program Files\Trend Micro\AMSP\module\20013\6.5.1143\5.0.1045\
   Windows 10: C:\Program Files\Trend Micro\AMSP\module\20013\6.5.1143\5.0.1051\
   Windows 10: C:\Program Files\Trend Micro\AMSP\module\20013\res\
   
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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