White Header Space in Internet Explorer

When I use Internet Explorer, my header and tagline move to the left hand side and there is a huge amount of white space that isn't normally there (when I use Chrome). Can someone please help me figure out what might be causing this? I've read of other issues when using internet explorer but none of those seem to match my issue exactly. I'm ready to go "live" but I don't want visitors who use Internet Explorer to see the website with so much white space as their initial impression of the site. I'm sure I've made a mistake in the coding as I'm very new to this. Any thoughts would be appreciated. Thank you so much. http://nickthebuilder.com.previewdns.com/