To set Internet Explorer as the default browser, Open the Control Panel and go to the Internet Options.
Click the Programs tab.
Check the option Internet Explorer should check to see whether it is the default browser.
The next time you open Internet Explorer, you should be prompted to set it as the default browser.
If the option Internet Explorer should check to see whether it is the
default browser is already checked, click the Reset Web Settings button (Uncheck Also reset my home page to keep your current homepage settings). This will reset Internet Explorer as the default browser. You may need to reset your Default Email and Default Newsgroup programs after resetting Internet Explorer like this.
