IE7 not loading page

Hello all, not sure if this is the right place to post this, but I'll continue anyway.

I've made a site, and, it's working well on Firefox and Opera, however, whenever I try to load it on IE7, it doesn't even load the whole page, so I'm thinking it's not just a CSS issue (otherwise I would've been able to work it out myself). To demonstrate, I'll post some screenshots.

Here is what the site looks like in any *proper* browser:
http://img.waffleimages.com/b9deb2e2118ef2790ce91109735e14f780b0bbfe/fir...

Here is what it looks like in IE7:
http://img.waffleimages.com/263521a635ab66dc3559fda2a74351fbd2837082/ie7...

Wondering why it didn't come up, I delved into what IE7 sees as the page source:
http://img.waffleimages.com/bf72e1430f384ee9b9dafe10c6b8d5df20a21c72/ie7...

I'm stumped to be honest as to why it gets stuck at the "nav". Oh, by the way, I'm using the Arc Materia theme, slightly modified, but only in terms of changing the color.

Any help would be *greatly* appreciated.

Thanks in advance.