How do I change my web browser default?

Okay, a while ago, my Internet Explorer was messed up, so I used Opera. Not IE is working again, and i want to make it my Default Web Browser. How do I do that? Because if i open something in my email, it goes to Opera, and i want it to go to IE.

Nevermind, you can close this.

someone on a different forum told me how to do it.