IE Display Issues

Hello –

I am building this site for a client – using a purchased theme and customizing it to her design. Everything displays great in every browser – but IE 7 and 8 of course. (I’m not going anywhere near trying to fix it for 6). Does anyone have any advice how I can resolve these display issues? I don’t even know where to start!! The extra space at the bottom and the general mess of the portfolio section are my main concerns. Any advice would be greatly appreciated!! ??

The url is illuminatedesignco.com but the problem pages are moreso in the portfolio section – so more specifically, please check out:
https://www.illuminatedesignco.com/design/annual-reports/

Thanks!