On a windows 10 computer reboot into Safe Mode with Networking:
- Click the Start button or press the Windows key on the keyboard
- Click Power
- While holding SHIFT on the keyboard, click Restart
- Windows will reboot and prompt with a few different options
- Choose Troubleshoot
- Choose Advanced Options
- Choose Startup Settings
- Click Restart
- After rebooting, Windows will prompt with several different startup options
- Choose Safe Mode with Networking and press Enter
- Login as an Administrator on the computer
- Run regedit. Go to path in the registry: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\TrendMicro\PC-cillinNTCorp\CurrentVersion\Misc
- Edit Allow Uninstall and set it to a value of 1
- Reboot the computer again to normal mode so the windows installer service is working
- From Add/Remove programs in control panel uninstall Trend. It will proceed without prompting for the uninstall password.
See how to manually remove the agent here: https://success.trendmicro.com/solution/1117997-uninstalling-worry-free-business-security-services-wfbs-svc-agents#collapseFour