Default Browser on a PC (Windows)

Ignerrant Mac user question.

The girlfriend gave Opera a whirl over the weekend and decided she wants to stick with Internet Explorer for the time being.

Somehow, Opera has now been designated as what the OS does with webby-flavored URLs. Maybe she clicked the “default browser?” dialog checkbox when it came up, I didn’t see her do it, she doesn’t recall.

How does one set it back? In MacOS 9, all that stuff is in the Internet Control Panel, and in a similar place in X; in Windows I can find where to change the default email program but default browser doesn’t appear to be in the same spot at all.

XP Pro.

In IE: Tools > Internet Options > Programs tab > check " Internet Explorer should check to see if it is the default browser". Click OK, then restart IE. IE should then ask you if you want to set it as default. Click Yes.