If you suspect your computer is infected with adware, try installing a spyware scanner, such as Ad-Aware. These programs are specifically designed to alert you to spyware, but they will also notify you if they detect less-invasive adware on your system. You can also check your installed programs list for applications you don’t recognize. Just make sure to research programs before removing them, so you don’t wind up removing something your computer needs. You should also check your web browser’s add-on list, and remove anything you don’t use.