This procedure work as of June 5th 2010
When trying to uninstall TrendMico Office Scan you are prompted for a password.
- Start -> run and type MSCONFIG
- Under services and uncheck TrendMicro Unauthorized Change Prevention Service
- Restart the computer
- Start -> run type Regedit
- Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\PC-cillinNTCorp\CurrentVersion\Misc
- Changing the AllowUninstall value to 1