Try installing it this way.
First go to the control panel and then to the user control panel and turn off the UAC. Don't reboot yet though.
Now I need you to reboot windows cleanly. To do that please go to the run command and type in msconfig . Once that starts, select selective startup, and then uncheck the load startup items. Now click on the services tab, and down near the bottom of the window, check the box that says Hide all Microsoft Services now go up and uncheck all the services still listed, make sure you scroll down the list if need to unselect all the non Microsoft services. Now click apply, then click OK and reboot the computer.
Now your computer is running with UAC turned off, and with only windows running. Try installing your Trend Micro Product now. Once it installs, or fails, turn UAC back on and before you reboot, run msconfig again and select Normal startup, then click apply then OK and reboot.
Let me know how it goes.