IE suddenly can't open certain sites?

[Dr. Boogie]

Recently, I've been having this weird problem with Internet Explorer where it will start loading a page, but then a popup will appear saying that it can't open the site, and then it switches over to the "Internet Explorer cannot display the webpage" screen. It's happened a couple time while trying to look through old articles on the site. I think it has something to do with the ads being loaded, but I don't know what.

Anyone know anything about this?