Once installed on your machine, Pop Preventer may start monitoring your web browsing habits, such as what pages you usually load and what search terms you usually type in the search page. Pop Preventer may also deliver excessive pop-up advertisements even when you are not browsing the Internet. Pop Preventer has also an ability to slow down your computer performance by using your hard drive resources in order to deliver advertisements on your computer screen. Pop Preventer may also log your keystrokes and make screenshots of your desktop in order to send it to a third party.