How to Find Your Trend Micro Serial Number
You need a valid serial number to install your software. Your serial number consists of four letters followed by sixteen digits, like this example: PQRS-1234-5678-9012-3456.

  
 
   If your software came in a box, look for the serial number on a sticker attached to the compact disc jacket. It should look something like this example:
        
  
 
   If you downloaded the software, then your serial number appears in the confirmation email that you received upon completing your purchase.
  
 
   If reinstalling the software, you can retrieve your serial number by visiting
http://www.trendsecure.com/my_account.