"Trend Micro Already Installed" message appears when upgrading from a lower version of Trend Micro Security software

You see the following error message when upgrading your Trend Micro Security software to the latest version:

Trend Micro Already Installed

Trend Micro Security Already Installed ...
You must remove version 10.0 before installing this software. Do you want to do that now?

This happens when you have previously installed the Trend Micro program.

We recommend that you print out this document or bookmark this page before proceeding because you will be asked to restart your computer during the procedure.


To resolve the issue, follow the steps below:

STEP 1: Run the Uninstall Tool
Run the Uninstall Tool to remove the remnants of your previous installation:
  1. Download the Uninstall Tool by clicking the download button below:



  2. Double-click Ti_110_win_en_Tool_UninstallTool_hfb0001.exe to run it.
    Click Yes when the User Account Control Window appears.
  3. Read the License Agreement, click I accept the terms of the license agreement, then click Next.
  4. Click Install.
  5. Click Uninstall Software.
  6. Enter the captcha characters and click Continue.
  7. Click Uninstall.
  8. Click Yes when prompted to restart your computer.

STEP 2: Reinstall/Upgrade Trend Micro Security
On April 8th, 2014, Microsoft formally announced the Windows XP end of support. Because Microsoft no longer fixes issues on Windows XP, it has become increasingly difficult for Trend Micro to keep users safe on this operating system. We encourage all of our users to upgrade their PCs to a more modern operating system which will provide greater stability and security. You can refer to this article for more information.
To reinstall your program, do the following:
  1. Download the installer file to begin the installation.
    Serial Number Starts with an 'X'
    Maximum Security
    Serial Number Starts with a 'P'
    Internet Security
    Serial Number Starts with an 'A'
    Antivirus+ Security

    Note: If your serial number starts with "T", contact Best Buy or your Internet Service Provider, depending on where you got the product.

  2. Double-click the installer to run it.
    Click Yes when the User Account Control window appears.
  3. Wait for the installer to extract the files needed for the installation.
  4. Wait as Trend Micro checks if your computer is compatible for installation.
    System Check
  5. Type your serial number, then click Next.
    Type serial number

  6. Read the License Agreement, then click Agree and Install.
    License Agreement
  7. Wait for the program to install. This may take a couple of minutes.
  8. Click Finish.
    You will see the main console of your Trend Micro Security program.
Video Tutorial

Applies To: Antivirus+ Security - 2016;2015;2017;Internet Security - 2016;Internet Security - 2015;Internet Security - 2017;Maximum Security - 2016;Maximum Security - 2015;Maximum Security - 2017;Premium Security - 2016;Premium Security - 2015;Premium Security - 2017;

Last Updated: Dec. 22, 2016 11:41 PM (PST)
Solution ID: 1104137