Sidebars not showing in Internet Explorer

I just finished revamping my website, I switched over from a Moveable Type blog, I completely deactivated it, so nothing from that blog was transferred over, I figured I’d start clean.

I installed WordPress and setup the layout, everything was working, except for the RSS Feeds, not worried about that right now.
Anyways, a few friends that only use Internet Explorer (I use Firefox) can only see the left sidebar & header, that’s it. They don’t see the middle sidebar, right sidebar, or footer?? I’m at a loss.

This is the first time I’ve done any work with CSS & PHP, any advice? Idea’s?

My address is https://www.rockinknit.com