To enable the Trend Micro OfficeScan IE plugin, use the following article on how to enable IE extensions via group policy.
The Class IDs for the OfficeScan IE extension that you’ll need are: {959A5673-7971-48E6-AF54-58F745AC4ABC} and {BBACBAFD-FA5E-4079-8B33-00EB9F13D4AC}, though it’s worth following the article to discover the class IDs for yourself in case they have changed since I wrote this.