When you need to uninstall Trend Micro from a pc when you don't have access to the install password, change the following registry setting: HKLM\SOFTWARE\TrendMicro\PC-cillinNTCorp\CurrentVersion\Misc Set “Allow Uninstall” to 1

Then uninstall via Add/Remove Programs as normal, without a password prompt.

With thanks to: http://www.sugarloaftech.com/