How to Find My Default Browser
Many computer users have at least two browsers installed on their systems. Because browsers are free and easy to download, users tend to shop around and use the one they are most comfortable with. If you are one of those people and need to determine your default browser, Windows makes it easy to do so. Keep in mind that you may have different default browsers for different functions.
Log in to the system as the administrator. Click the "Start" button, and choose "Default Programs."
Click the "Set program access and computer defaults" link on the page that appears.
Click the small arrow associated with the configuration of your system, which will be indicated by the radio button. The window will expand.
View the browser that the radio button is next to in the Web Browser section. This is your default browser.