Odd Internet Explorer 7 issue (seems to be XML related)

I’ll say it for you:
Use firefox/opera/whatever blah blah.

Anyway I can’t always do that, though I do use it when I have the ability to. Here’s my issue, I cannot load certain sites*. I end up getting a prompt to download the XML and cannot actually view the page. It works fine on every other browser I’ve tried. Am i missing something stupid? Some setting that’s turned off by default (everywhere I’ve used IE7 has the issue) perhaps? Its getting quite annoying, though it’s actually more of a curiosity than a hassle in most cases. I’ve attempted to search and play around with settings and I can’t find any resolution to the issue. As usual, thanks in advance.

*two examples being these, they aren’t the only ones I’ve encountered but they’re the only two I can think of off hand:
http://www.worldofwarcraft.com/wrath/