PopUp Preventor does exactly what it says, it keeps all those annoying pop up ads, and windows from continually opening and crashing your browser. PopUp Preventor is better and faster than most of the similar products around. With PopUp Preventor you can toggle the software "Off" and "On". And unlike other software PopUp Preventer does not prohibit you from opening a new browser window or keep you from opening email links! It is also very simple to use, and starts automatically in your system tray every time you turn on your computer, to immediately begin killing pop ups.B PopUp Preventor is also Internet Explorer, and Netscape compatible! Start blocking now!