If your Trend Micro Internet Security from Best Buy is showing a "Protection Disabled" error and can't update to the latest version, don't worry — a quick reinstall will get you back to full protection. This guide walks you through uninstalling and reinstalling the software on Windows.
Step 1: Uninstall Trend Micro Internet Security
- Hold the Windows key and press R on your keyboard to open the Run dialog.
- Type Supporttool.exe and click OK.
- In the Diagnostic Toolkit window, click the (C) Uninstall tab.
- Click (5) Stop All Components and wait for it to complete.
- Click (1) Uninstall Software and follow the on-screen prompts.
- Restart your computer when prompted.
🔔 Important: Make sure your computer fully restarts before moving to the next step. This ensures all Trend Micro components are completely removed.
Step 2: Reinstall Trend Micro Internet Security
- Open your web browser and go to TrendLife Quick Help.
- Click Download Internet Security from Best Buy.
- Open the downloaded file to start the installer.
- Wait for the installation to finish — this may take a few minutes.
- Enter your Serial Number if prompted.
- Once installed, click the Show Hidden Icons arrow (▲) on your Windows taskbar (bottom-right corner).
- Click the Trend Micro icon, then click Open Main Console.
- Your Trend Micro Internet Security status should now show Protected. You're all set! ✅
Troubleshooting
- If the Diagnostic Toolkit doesn't open: Make sure you typed Supporttool.exe correctly in the Run dialog. If it still doesn't open, Trend Micro may not be installed properly — skip to Step 2 to download and install a fresh copy.
- If the "Protection Disabled" error persists after reinstalling: Restart your computer one more time, then open the main console to check the status.
- If you can't find your Serial Number: Check your Best Buy purchase receipt, the email confirmation from Best Buy, or the product card inside the box.
- If the issue continues: Contact Trend Micro Support for further assistance.