1. Open Internet Explorer >> Click on Tools >> Click on Internet Options
2. Click on "Programs" tab on the Internet properties window >> Click on "Make default" button
3. Click on "OK"
4. That's it, Internet Explorer is now your default browser. You can also do it in another simple way.
5. Press the Windows key + R at once
6. Type "inetcpl.cpl" (without the quotes) in the run box >> Press "Enter" key
7. Click on "Programs" tab on the Internet properties window >> Click on "Make default" button
8. Click on "OK". That should do it.