1.first of all open a internet browser and i will give you the link then type there url which iswww.trendmicro.com.au/downloadme.
2.when you hit enter then your program will start download automatically,after that you will get a more options likesave,run and cancel,
then you just need to click onrunorsave.
3.Now download the installer file to begin the installation, then just double click on the program to run it.
4.Now it will ask for your serial number,then click Next.
5.Follow the on screen instructions during the trendmicro installer file
6.You will get a terms and Agreement, then click Agree and Install.
7.Mean while,Wait as the program installs, this may take a couple of minutes.
8.Now it will ask for your email address, then click on Next.
9.Fill out the Account Information of trend micro security on your window, then click Next.
10.Check all the informations that you provided, then click Next.