Hello ppadro and welcome to Trend Micro Community!
Based on what you had experienced, you might be dealing with a website redirection issue. Have you downloaded or installed any program before this thing happened? Also, what browsers were affected with this issue and is the Trend Micro Toolbar enabled? Kindly let us know.
For the meantime, you can try the instructions provided on the link below:
Kindly log-in to the administrator account in that computer for you to configure the settings. Or when a prompt asked for an administrative password, type in the password for the administrator account.
You may also try resetting your browser. Here's how to:
