Solved MessagePage (Read-Only) in Word

A MessagePage (Read-Only) in Word suddenly pops up when I click on a link.

I clicked to unsubscribe to a web site and was taken to MessagePage (Read-Only) in Word.

Why is this? How do I get rid of it?

Problem now solved

I had to go to the default program (which is in the start menu or control panel and set Internet Explorer as the default browser.