Css Issues with 2.6?

I recently uploaded wp 2.6 on my new site and every theme that I try I don’t see black or the outline of boxes or the header. For example this is the theme that I chose Magazine Style Theme (http://www.free-wp-themes.com/wordpress/Magazine_Style_Theme/) which is compatable with 2.6 but when I upload it I get http://emailspamcollection.com/ it looks like css is missing or not working right. This happens with every theme I’m trying.

I’m no css expert but can anyone provide some help here so I can get a theme installed?

Thanks!